csp2: CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/lib/tcl8.6/clock.tcl comparison

comparison CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/lib/tcl8.6/clock.tcl @ 69:33d812a61356

planemo upload commit 2e9511a184a1ca667c7be0c6321a36dc4e3d116d

author	jpayne
date	Tue, 18 Mar 2025 17:55:14 -0400
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comparison

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-:0e9998148a16
+:33d812a61356
+#----------------------------------------------------------------------
+#
+# clock.tcl --
+#
+#	This file implements the portions of the [clock] ensemble that are
+#	coded in Tcl.  Refer to the users' manual to see the description of
+#	the [clock] command and its subcommands.
+#
+#
+#----------------------------------------------------------------------
+#
+# Copyright (c) 2004-2007 Kevin B. Kenny
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+#
+#----------------------------------------------------------------------
+# We must have message catalogs that support the root locale, and we need
+# access to the Registry on Windows systems.
+uplevel \#0 {
+package require msgcat 1.6
+if { $::tcl_platform(platform) eq {windows} } {
+	if { [catch { package require registry 1.1 }] } {
+	    namespace eval ::tcl::clock [list variable NoRegistry {}]
+	}
+}
+}
+# Put the library directory into the namespace for the ensemble so that the
+# library code can find message catalogs and time zone definition files.
+namespace eval ::tcl::clock \
+[list variable LibDir [file dirname [info script]]]
+#----------------------------------------------------------------------
+#
+# clock --
+#
+#	Manipulate times.
+#
+# The 'clock' command manipulates time.  Refer to the user documentation for
+# the available subcommands and what they do.
+#
+#----------------------------------------------------------------------
+namespace eval ::tcl::clock {
+# Export the subcommands
+namespace export format
+namespace export clicks
+namespace export microseconds
+namespace export milliseconds
+namespace export scan
+namespace export seconds
+namespace export add
+# Import the message catalog commands that we use.
+namespace import ::msgcat::mcload
+namespace import ::msgcat::mclocale
+namespace import ::msgcat::mc
+namespace import ::msgcat::mcpackagelocale
+}
+#----------------------------------------------------------------------
+#
+# ::tcl::clock::Initialize --
+#
+#	Finish initializing the 'clock' subsystem
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	Namespace variable in the 'clock' subsystem are initialized.
+#
+# The '::tcl::clock::Initialize' procedure initializes the namespace variables
+# and root locale message catalog for the 'clock' subsystem.  It is broken
+# into a procedure rather than simply evaluated as a script so that it will be
+# able to use local variables, avoiding the dangers of 'creative writing' as
+# in Bug 1185933.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::Initialize {} {
+rename ::tcl::clock::Initialize {}
+variable LibDir
+# Define the Greenwich time zone
+proc InitTZData {} {
+	variable TZData
+	array unset TZData
+	set TZData(:Etc/GMT) {
+	    {-9223372036854775808 0 0 GMT}
+	}
+	set TZData(:GMT) $TZData(:Etc/GMT)
+	set TZData(:Etc/UTC) {
+	    {-9223372036854775808 0 0 UTC}
+	}
+	set TZData(:UTC) $TZData(:Etc/UTC)
+	set TZData(:localtime) {}
+}
+InitTZData
+mcpackagelocale set {}
+::msgcat::mcpackageconfig set mcfolder [file join $LibDir msgs]
+::msgcat::mcpackageconfig set unknowncmd ""
+::msgcat::mcpackageconfig set changecmd ChangeCurrentLocale
+# Define the message catalog for the root locale.
+::msgcat::mcmset {} {
+	AM {am}
+	BCE {B.C.E.}
+	CE {C.E.}
+	DATE_FORMAT {%m/%d/%Y}
+	DATE_TIME_FORMAT {%a %b %e %H:%M:%S %Y}
+	DAYS_OF_WEEK_ABBREV	{
+	    Sun Mon Tue Wed Thu Fri Sat
+	}
+	DAYS_OF_WEEK_FULL	{
+	    Sunday Monday Tuesday Wednesday Thursday Friday Saturday
+	}
+	GREGORIAN_CHANGE_DATE	2299161
+	LOCALE_DATE_FORMAT {%m/%d/%Y}
+	LOCALE_DATE_TIME_FORMAT {%a %b %e %H:%M:%S %Y}
+	LOCALE_ERAS {}
+	LOCALE_NUMERALS		{
+	    00 01 02 03 04 05 06 07 08 09
+	    10 11 12 13 14 15 16 17 18 19
+	    20 21 22 23 24 25 26 27 28 29
+	    30 31 32 33 34 35 36 37 38 39
+	    40 41 42 43 44 45 46 47 48 49
+	    50 51 52 53 54 55 56 57 58 59
+	    60 61 62 63 64 65 66 67 68 69
+	    70 71 72 73 74 75 76 77 78 79
+	    80 81 82 83 84 85 86 87 88 89
+	    90 91 92 93 94 95 96 97 98 99
+	}
+	LOCALE_TIME_FORMAT {%H:%M:%S}
+	LOCALE_YEAR_FORMAT {%EC%Ey}
+	MONTHS_ABBREV		{
+	    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
+	}
+	MONTHS_FULL		{
+	    	January		February	March
+	    	April		May		June
+	    	July		August		September
+		October		November	December
+	}
+	PM {pm}
+	TIME_FORMAT {%H:%M:%S}
+	TIME_FORMAT_12 {%I:%M:%S %P}
+	TIME_FORMAT_24 {%H:%M}
+	TIME_FORMAT_24_SECS {%H:%M:%S}
+}
+# Define a few Gregorian change dates for other locales.  In most cases
+# the change date follows a language, because a nation's colonies changed
+# at the same time as the nation itself.  In many cases, different
+# national boundaries existed; the dominating rule is to follow the
+# nation's capital.
+# Italy, Spain, Portugal, Poland
+::msgcat::mcset it GREGORIAN_CHANGE_DATE 2299161
+::msgcat::mcset es GREGORIAN_CHANGE_DATE 2299161
+::msgcat::mcset pt GREGORIAN_CHANGE_DATE 2299161
+::msgcat::mcset pl GREGORIAN_CHANGE_DATE 2299161
+# France, Austria
+::msgcat::mcset fr GREGORIAN_CHANGE_DATE 2299227
+# For Belgium, we follow Southern Netherlands; Liege Diocese changed
+# several weeks later.
+::msgcat::mcset fr_BE GREGORIAN_CHANGE_DATE 2299238
+::msgcat::mcset nl_BE GREGORIAN_CHANGE_DATE 2299238
+# Austria
+::msgcat::mcset de_AT GREGORIAN_CHANGE_DATE 2299527
+# Hungary
+::msgcat::mcset hu GREGORIAN_CHANGE_DATE 2301004
+# Germany, Norway, Denmark (Catholic Germany changed earlier)
+::msgcat::mcset de_DE GREGORIAN_CHANGE_DATE 2342032
+::msgcat::mcset nb GREGORIAN_CHANGE_DATE 2342032
+::msgcat::mcset nn GREGORIAN_CHANGE_DATE 2342032
+::msgcat::mcset no GREGORIAN_CHANGE_DATE 2342032
+::msgcat::mcset da GREGORIAN_CHANGE_DATE 2342032
+# Holland (Brabant, Gelderland, Flanders, Friesland, etc. changed at
+# various times)
+::msgcat::mcset nl GREGORIAN_CHANGE_DATE 2342165
+# Protestant Switzerland (Catholic cantons changed earlier)
+::msgcat::mcset fr_CH GREGORIAN_CHANGE_DATE 2361342
+::msgcat::mcset it_CH GREGORIAN_CHANGE_DATE 2361342
+::msgcat::mcset de_CH GREGORIAN_CHANGE_DATE 2361342
+# English speaking countries
+::msgcat::mcset en GREGORIAN_CHANGE_DATE 2361222
+# Sweden (had several changes onto and off of the Gregorian calendar)
+::msgcat::mcset sv GREGORIAN_CHANGE_DATE 2361390
+# Russia
+::msgcat::mcset ru GREGORIAN_CHANGE_DATE 2421639
+# Romania (Transylvania changed earler - perhaps de_RO should show the
+# earlier date?)
+::msgcat::mcset ro GREGORIAN_CHANGE_DATE 2422063
+# Greece
+::msgcat::mcset el GREGORIAN_CHANGE_DATE 2423480
+#------------------------------------------------------------------
+#
+#				CONSTANTS
+#
+#------------------------------------------------------------------
+# Paths at which binary time zone data for the Olson libraries are known
+# to reside on various operating systems
+variable ZoneinfoPaths {}
+foreach path {
+	/usr/share/zoneinfo
+	/usr/share/lib/zoneinfo
+	/usr/lib/zoneinfo
+	/usr/local/etc/zoneinfo
+} {
+	if { [file isdirectory $path] } {
+	    lappend ZoneinfoPaths $path
+	}
+}
+# Define the directories for time zone data and message catalogs.
+variable DataDir [file join $LibDir tzdata]
+# Number of days in the months, in common years and leap years.
+variable DaysInRomanMonthInCommonYear \
+	{ 31 28 31 30 31 30 31 31 30 31 30 31 }
+variable DaysInRomanMonthInLeapYear \
+	{ 31 29 31 30 31 30 31 31 30 31 30 31 }
+variable DaysInPriorMonthsInCommonYear [list 0]
+variable DaysInPriorMonthsInLeapYear [list 0]
+set i 0
+foreach j $DaysInRomanMonthInCommonYear {
+	lappend DaysInPriorMonthsInCommonYear [incr i $j]
+}
+set i 0
+foreach j $DaysInRomanMonthInLeapYear {
+	lappend DaysInPriorMonthsInLeapYear [incr i $j]
+}
+# Another epoch (Hi, Jeff!)
+variable Roddenberry 1946
+# Integer ranges
+variable MINWIDE -9223372036854775808
+variable MAXWIDE 9223372036854775807
+# Day before Leap Day
+variable FEB_28	       58
+# Translation table to map Windows TZI onto cities, so that the Olson
+# rules can apply.  In some cases the mapping is ambiguous, so it's wise
+# to specify $::env(TCL_TZ) rather than simply depending on the system
+# time zone.
+# The keys are long lists of values obtained from the time zone
+# information in the Registry.  In order, the list elements are:
+# 	Bias StandardBias DaylightBias
+#   StandardDate.wYear StandardDate.wMonth StandardDate.wDayOfWeek
+#   StandardDate.wDay StandardDate.wHour StandardDate.wMinute
+#   StandardDate.wSecond StandardDate.wMilliseconds
+#   DaylightDate.wYear DaylightDate.wMonth DaylightDate.wDayOfWeek
+#   DaylightDate.wDay DaylightDate.wHour DaylightDate.wMinute
+#   DaylightDate.wSecond DaylightDate.wMilliseconds
+# The values are the names of time zones where those rules apply.  There
+# is considerable ambiguity in certain zones; an attempt has been made to
+# make a reasonable guess, but this table needs to be taken with a grain
+# of salt.
+variable WinZoneInfo [dict create {*}{
+	{-43200 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}  :Pacific/Kwajalein
+	{-39600 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}	 :Pacific/Midway
+	{-36000 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}  :Pacific/Honolulu
+{-32400 0 3600 0 11 0 1 2 0 0 0 0 3 0 2 2 0 0 0} :America/Anchorage
+{-28800 0 3600 0 11 0 1 2 0 0 0 0 3 0 2 2 0 0 0} :America/Los_Angeles
+{-28800 0 3600 0 10 0 5 2 0 0 0 0 4 0 1 2 0 0 0} :America/Tijuana
+{-25200 0 3600 0 11 0 1 2 0 0 0 0 3 0 2 2 0 0 0} :America/Denver
+{-25200 0 3600 0 10 0 5 2 0 0 0 0 4 0 1 2 0 0 0} :America/Chihuahua
+	{-25200 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}  :America/Phoenix
+	{-21600 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}  :America/Regina
+	{-21600 0 3600 0 11 0 1 2 0 0 0 0 3 0 2 2 0 0 0} :America/Chicago
+{-21600 0 3600 0 10 0 5 2 0 0 0 0 4 0 1 2 0 0 0} :America/Mexico_City
+	{-18000 0 3600 0 11 0 1 2 0 0 0 0 3 0 2 2 0 0 0} :America/New_York
+	{-18000 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}  :America/Indianapolis
+	{-14400 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}  :America/Caracas
+{-14400 0 3600 0 3 6 2 23 59 59 999 0 10 6 2 23 59 59 999}
+							 :America/Santiago
+{-14400 0 3600 0 2 0 5 2 0 0 0 0 11 0 1 2 0 0 0} :America/Manaus
+{-14400 0 3600 0 11 0 1 2 0 0 0 0 3 0 2 2 0 0 0} :America/Halifax
+	{-12600 0 3600 0 10 0 5 2 0 0 0 0 4 0 1 2 0 0 0} :America/St_Johns
+	{-10800 0 3600 0 2 0 2 2 0 0 0 0 10 0 3 2 0 0 0} :America/Sao_Paulo
+	{-10800 0 3600 0 10 0 5 2 0 0 0 0 4 0 1 2 0 0 0} :America/Godthab
+	{-10800 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}  :America/Buenos_Aires
+{-10800 0 3600 0 2 0 5 2 0 0 0 0 11 0 1 2 0 0 0} :America/Bahia
+{-10800 0 3600 0 3 0 2 2 0 0 0 0 10 0 1 2 0 0 0} :America/Montevideo
+	{-7200 0 3600 0 9 0 5 2 0 0 0 0 3 0 5 2 0 0 0}   :America/Noronha
+	{-3600 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}  :Atlantic/Azores
+	{-3600 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Atlantic/Cape_Verde
+	{0 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}       :UTC
+	{0 0 3600 0 10 0 5 2 0 0 0 0 3 0 5 1 0 0 0}      :Europe/London
+	{3600 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}    :Africa/Kinshasa
+	{3600 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}   :CET
+{7200 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}    :Africa/Harare
+{7200 0 3600 0 9 4 5 23 59 59 0 0 4 4 5 23 59 59 0}
+			      				 :Africa/Cairo
+	{7200 0 3600 0 10 0 5 4 0 0 0 0 3 0 5 3 0 0 0}   :Europe/Helsinki
+{7200 0 3600 0 9 0 3 2 0 0 0 0 3 5 5 2 0 0 0}    :Asia/Jerusalem
+	{7200 0 3600 0 9 0 5 1 0 0 0 0 3 0 5 0 0 0 0}    :Europe/Bucharest
+	{7200 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}   :Europe/Athens
+{7200 0 3600 0 9 5 5 1 0 0 0 0 3 4 5 0 0 0 0}    :Asia/Amman
+{7200 0 3600 0 10 6 5 23 59 59 999 0 3 0 5 0 0 0 0}
+							 :Asia/Beirut
+{7200 0 -3600 0 4 0 1 2 0 0 0 0 9 0 1 2 0 0 0}   :Africa/Windhoek
+	{10800 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Riyadh
+	{10800 0 3600 0 10 0 1 4 0 0 0 0 4 0 1 3 0 0 0}  :Asia/Baghdad
+	{10800 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}  :Europe/Moscow
+	{12600 0 3600 0 9 2 4 2 0 0 0 0 3 0 1 2 0 0 0}   :Asia/Tehran
+{14400 0 3600 0 10 0 5 5 0 0 0 0 3 0 5 4 0 0 0}  :Asia/Baku
+	{14400 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Muscat
+	{14400 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}  :Asia/Tbilisi
+	{16200 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Kabul
+	{18000 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Karachi
+	{18000 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}  :Asia/Yekaterinburg
+	{19800 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Calcutta
+	{20700 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Katmandu
+	{21600 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Dhaka
+	{21600 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}  :Asia/Novosibirsk
+	{23400 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Rangoon
+	{25200 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Bangkok
+	{25200 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}  :Asia/Krasnoyarsk
+	{28800 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Chongqing
+	{28800 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}  :Asia/Irkutsk
+	{32400 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Asia/Tokyo
+	{32400 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}  :Asia/Yakutsk
+	{34200 0 3600 0 3 0 5 3 0 0 0 0 10 0 5 2 0 0 0}  :Australia/Adelaide
+	{34200 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Australia/Darwin
+	{36000 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Australia/Brisbane
+	{36000 0 3600 0 10 0 5 3 0 0 0 0 3 0 5 2 0 0 0}  :Asia/Vladivostok
+	{36000 0 3600 0 3 0 5 3 0 0 0 0 10 0 1 2 0 0 0}  :Australia/Hobart
+	{36000 0 3600 0 3 0 5 3 0 0 0 0 10 0 5 2 0 0 0}  :Australia/Sydney
+	{39600 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Pacific/Noumea
+	{43200 0 3600 0 3 0 3 3 0 0 0 0 10 0 1 2 0 0 0}  :Pacific/Auckland
+	{43200 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Pacific/Fiji
+	{46800 0 3600 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}   :Pacific/Tongatapu
+}]
+# Groups of fields that specify the date, priorities, and code bursts that
+# determine Julian Day Number given those groups.  The code in [clock
+# scan] will choose the highest priority (lowest numbered) set of fields
+# that determines the date.
+variable DateParseActions {
+	{ seconds } 0 {}
+	{ julianDay } 1 {}
+	{ era century yearOfCentury month dayOfMonth } 2 {
+	    dict set date year [expr { 100 * [dict get $date century]
+				       + [dict get $date yearOfCentury] }]
+	    set date [GetJulianDayFromEraYearMonthDay $date[set date {}] \
+			  $changeover]
+	}
+	{ era century yearOfCentury dayOfYear } 2 {
+	    dict set date year [expr { 100 * [dict get $date century]
+				       + [dict get $date yearOfCentury] }]
+	    set date [GetJulianDayFromEraYearDay $date[set date {}] \
+			  $changeover]
+	}
+	{ century yearOfCentury month dayOfMonth } 3 {
+	    dict set date era CE
+	    dict set date year [expr { 100 * [dict get $date century]
+				       + [dict get $date yearOfCentury] }]
+	    set date [GetJulianDayFromEraYearMonthDay $date[set date {}] \
+			  $changeover]
+	}
+	{ century yearOfCentury dayOfYear } 3 {
+	    dict set date era CE
+	    dict set date year [expr { 100 * [dict get $date century]
+				       + [dict get $date yearOfCentury] }]
+	    set date [GetJulianDayFromEraYearDay $date[set date {}] \
+			  $changeover]
+	}
+	{ iso8601Century iso8601YearOfCentury iso8601Week dayOfWeek } 3 {
+	    dict set date era CE
+	    dict set date iso8601Year \
+		[expr { 100 * [dict get $date iso8601Century]
+			+ [dict get $date iso8601YearOfCentury] }]
+	    set date [GetJulianDayFromEraYearWeekDay $date[set date {}] \
+			 $changeover]
+	}
+	{ yearOfCentury month dayOfMonth } 4 {
+	    set date [InterpretTwoDigitYear $date[set date {}] $baseTime]
+	    dict set date era CE
+	    set date [GetJulianDayFromEraYearMonthDay $date[set date {}] \
+			  $changeover]
+	}
+	{ yearOfCentury dayOfYear } 4 {
+	    set date [InterpretTwoDigitYear $date[set date {}] $baseTime]
+	    dict set date era CE
+	    set date [GetJulianDayFromEraYearDay $date[set date {}] \
+			  $changeover]
+	}
+	{ iso8601YearOfCentury iso8601Week dayOfWeek } 4 {
+	    set date [InterpretTwoDigitYear \
+			  $date[set date {}] $baseTime \
+			  iso8601YearOfCentury iso8601Year]
+	    dict set date era CE
+	    set date [GetJulianDayFromEraYearWeekDay $date[set date {}] \
+			 $changeover]
+	}
+	{ month dayOfMonth } 5 {
+	    set date [AssignBaseYear $date[set date {}] \
+			  $baseTime $timeZone $changeover]
+	    set date [GetJulianDayFromEraYearMonthDay $date[set date {}] \
+			  $changeover]
+	}
+	{ dayOfYear } 5 {
+	    set date [AssignBaseYear $date[set date {}] \
+			  $baseTime $timeZone $changeover]
+	    set date [GetJulianDayFromEraYearDay $date[set date {}] \
+			 $changeover]
+	}
+	{ iso8601Week dayOfWeek } 5 {
+	    set date [AssignBaseIso8601Year $date[set date {}] \
+			  $baseTime $timeZone $changeover]
+	    set date [GetJulianDayFromEraYearWeekDay $date[set date {}] \
+			 $changeover]
+	}
+	{ dayOfMonth } 6 {
+	    set date [AssignBaseMonth $date[set date {}] \
+			  $baseTime $timeZone $changeover]
+	    set date [GetJulianDayFromEraYearMonthDay $date[set date {}] \
+			  $changeover]
+	}
+	{ dayOfWeek } 7 {
+	    set date [AssignBaseWeek $date[set date {}] \
+			  $baseTime $timeZone $changeover]
+	    set date [GetJulianDayFromEraYearWeekDay $date[set date {}] \
+			 $changeover]
+	}
+	{} 8 {
+	    set date [AssignBaseJulianDay $date[set date {}] \
+			  $baseTime $timeZone $changeover]
+	}
+}
+# Groups of fields that specify time of day, priorities, and code that
+# processes them
+variable TimeParseActions {
+	seconds 1 {}
+	{ hourAMPM minute second amPmIndicator } 2 {
+	    dict set date secondOfDay [InterpretHMSP $date]
+	}
+	{ hour minute second } 2 {
+	    dict set date secondOfDay [InterpretHMS $date]
+	}
+	{ hourAMPM minute amPmIndicator } 3 {
+	    dict set date second 0
+	    dict set date secondOfDay [InterpretHMSP $date]
+	}
+	{ hour minute } 3 {
+	    dict set date second 0
+	    dict set date secondOfDay [InterpretHMS $date]
+	}
+	{ hourAMPM amPmIndicator } 4 {
+	    dict set date minute 0
+	    dict set date second 0
+	    dict set date secondOfDay [InterpretHMSP $date]
+	}
+	{ hour } 4 {
+	    dict set date minute 0
+	    dict set date second 0
+	    dict set date secondOfDay [InterpretHMS $date]
+	}
+	{ } 5 {
+	    dict set date secondOfDay 0
+	}
+}
+# Legacy time zones, used primarily for parsing RFC822 dates.
+variable LegacyTimeZone [dict create \
+	gmt	+0000 \
+	ut	+0000 \
+	utc	+0000 \
+	bst	+0100 \
+	wet	+0000 \
+	wat	-0100 \
+	at	-0200 \
+	nft	-0330 \
+	nst	-0330 \
+	ndt	-0230 \
+	ast	-0400 \
+	adt	-0300 \
+	est	-0500 \
+	edt	-0400 \
+	cst	-0600 \
+	cdt	-0500 \
+	mst	-0700 \
+	mdt	-0600 \
+	pst	-0800 \
+	pdt	-0700 \
+	yst	-0900 \
+	ydt	-0800 \
+	hst	-1000 \
+	hdt	-0900 \
+	cat	-1000 \
+	ahst	-1000 \
+	nt	-1100 \
+	idlw	-1200 \
+	cet	+0100 \
+	cest	+0200 \
+	met	+0100 \
+	mewt	+0100 \
+	mest	+0200 \
+	swt	+0100 \
+	sst	+0200 \
+	fwt	+0100 \
+	fst	+0200 \
+	eet	+0200 \
+	eest	+0300 \
+	bt	+0300 \
+	it	+0330 \
+	zp4	+0400 \
+	zp5	+0500 \
+	ist	+0530 \
+	zp6	+0600 \
+	wast	+0700 \
+	wadt	+0800 \
+	jt	+0730 \
+	cct	+0800 \
+	jst	+0900 \
+	kst     +0900 \
+	cast	+0930 \
+jdt     +1000 \
+kdt     +1000 \
+	cadt	+1030 \
+	east	+1000 \
+	eadt	+1030 \
+	gst	+1000 \
+	nzt	+1200 \
+	nzst	+1200 \
+	nzdt	+1300 \
+	idle	+1200 \
+	a	+0100 \
+	b	+0200 \
+	c	+0300 \
+	d	+0400 \
+	e	+0500 \
+	f	+0600 \
+	g	+0700 \
+	h	+0800 \
+	i	+0900 \
+	k	+1000 \
+	l	+1100 \
+	m	+1200 \
+	n	-0100 \
+	o	-0200 \
+	p	-0300 \
+	q	-0400 \
+	r	-0500 \
+	s	-0600 \
+	t	-0700 \
+	u	-0800 \
+	v	-0900 \
+	w	-1000 \
+	x	-1100 \
+	y	-1200 \
+	z	+0000 \
+]
+# Caches
+variable LocaleNumeralCache {};	# Dictionary whose keys are locale
+					# names and whose values are pairs
+					# comprising regexes matching numerals
+					# in the given locales and dictionaries
+					# mapping the numerals to their numeric
+					# values.
+# variable CachedSystemTimeZone;    # If 'CachedSystemTimeZone' exists,
+					# it contains the value of the
+					# system time zone, as determined from
+					# the environment.
+variable TimeZoneBad {};	        # Dictionary whose keys are time zone
+					# names and whose values are 1 if
+					# the time zone is unknown and 0
+					# if it is known.
+variable TZData;			# Array whose keys are time zone names
+					# and whose values are lists of quads
+					# comprising start time, UTC offset,
+					# Daylight Saving Time indicator, and
+					# time zone abbreviation.
+variable FormatProc;		# Array mapping format group
+					# and locale to the name of a procedure
+					# that renders the given format
+}
+::tcl::clock::Initialize
+#----------------------------------------------------------------------
+#
+# clock format --
+#
+#	Formats a count of seconds since the Posix Epoch as a time of day.
+#
+# The 'clock format' command formats times of day for output.  Refer to the
+# user documentation to see what it does.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::format { args } {
+variable FormatProc
+variable TZData
+lassign [ParseFormatArgs {*}$args] format locale timezone
+set locale [string tolower $locale]
+set clockval [lindex $args 0]
+# Get the data for time changes in the given zone
+if {$timezone eq ""} {
+	set timezone [GetSystemTimeZone]
+}
+if {![info exists TZData($timezone)]} {
+	if {[catch {SetupTimeZone $timezone} retval opts]} {
+	    dict unset opts -errorinfo
+	    return -options $opts $retval
+	}
+}
+# Build a procedure to format the result. Cache the built procedure's name
+# in the 'FormatProc' array to avoid losing its internal representation,
+# which contains the name resolution.
+set procName formatproc'$format'$locale
+set procName [namespace current]::[string map {: {\:} \\ {\\}} $procName]
+if {[info exists FormatProc($procName)]} {
+	set procName $FormatProc($procName)
+} else {
+	set FormatProc($procName) \
+	    [ParseClockFormatFormat $procName $format $locale]
+}
+return [$procName $clockval $timezone]
+}
+#----------------------------------------------------------------------
+#
+# ParseClockFormatFormat --
+#
+#	Builds and caches a procedure that formats a time value.
+#
+# Parameters:
+#	format -- Format string to use
+#	locale -- Locale in which the format string is to be interpreted
+#
+# Results:
+#	Returns the name of the newly-built procedure.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ParseClockFormatFormat {procName format locale} {
+if {[namespace which $procName] ne {}} {
+	return $procName
+}
+# Map away the locale-dependent composite format groups
+EnterLocale $locale
+# Change locale if a fresh locale has been given on the command line.
+try {
+	return [ParseClockFormatFormat2 $format $locale $procName]
+} trap CLOCK {result opts} {
+	dict unset opts -errorinfo
+	return -options $opts $result
+}
+}
+proc ::tcl::clock::ParseClockFormatFormat2 {format locale procName} {
+set didLocaleEra 0
+set didLocaleNumerals 0
+set preFormatCode \
+	[string map [list @GREGORIAN_CHANGE_DATE@ \
+				       [mc GREGORIAN_CHANGE_DATE]] \
+	     {
+		 variable TZData
+		 set date [GetDateFields $clockval \
+			       $TZData($timezone) \
+			       @GREGORIAN_CHANGE_DATE@]
+	     }]
+set formatString {}
+set substituents {}
+set state {}
+set format [LocalizeFormat $locale $format]
+foreach char [split $format {}] {
+	switch -exact -- $state {
+	    {} {
+		if { [string equal % $char] } {
+		    set state percent
+		} else {
+		    append formatString $char
+		}
+	    }
+	    percent {			# Character following a '%' character
+		set state {}
+		switch -exact -- $char {
+		    % {			# A literal character, '%'
+			append formatString %%
+		    }
+		    a {			# Day of week, abbreviated
+			append formatString %s
+			append substituents \
+			    [string map \
+				 [list @DAYS_OF_WEEK_ABBREV@ \
+				      [list [mc DAYS_OF_WEEK_ABBREV]]] \
+				 { [lindex @DAYS_OF_WEEK_ABBREV@ \
+					[expr {[dict get $date dayOfWeek] \
+						   % 7}]]}]
+		    }
+		    A {			# Day of week, spelt out.
+			append formatString %s
+			append substituents \
+			    [string map \
+				 [list @DAYS_OF_WEEK_FULL@ \
+				      [list [mc DAYS_OF_WEEK_FULL]]] \
+				 { [lindex @DAYS_OF_WEEK_FULL@ \
+					[expr {[dict get $date dayOfWeek] \
+						   % 7}]]}]
+		    }
+		    b - h {		# Name of month, abbreviated.
+			append formatString %s
+			append substituents \
+			    [string map \
+				 [list @MONTHS_ABBREV@ \
+				      [list [mc MONTHS_ABBREV]]] \
+				 { [lindex @MONTHS_ABBREV@ \
+					[expr {[dict get $date month]-1}]]}]
+		    }
+		    B {			# Name of month, spelt out
+			append formatString %s
+			append substituents \
+			    [string map \
+				 [list @MONTHS_FULL@ \
+				      [list [mc MONTHS_FULL]]] \
+				 { [lindex @MONTHS_FULL@ \
+					[expr {[dict get $date month]-1}]]}]
+		    }
+		    C {			# Century number
+			append formatString %02d
+			append substituents \
+			    { [expr {[dict get $date year] / 100}]}
+		    }
+		    d {			# Day of month, with leading zero
+			append formatString %02d
+			append substituents { [dict get $date dayOfMonth]}
+		    }
+		    e {			# Day of month, without leading zero
+			append formatString %2d
+			append substituents { [dict get $date dayOfMonth]}
+		    }
+		    E {			# Format group in a locale-dependent
+					# alternative era
+			set state percentE
+			if {!$didLocaleEra} {
+			    append preFormatCode \
+				[string map \
+				     [list @LOCALE_ERAS@ \
+					  [list [mc LOCALE_ERAS]]] \
+				     {
+					 set date [GetLocaleEra \
+						       $date[set date {}] \
+						       @LOCALE_ERAS@]}] \n
+			    set didLocaleEra 1
+			}
+			if {!$didLocaleNumerals} {
+			    append preFormatCode \
+				[list set localeNumerals \
+				     [mc LOCALE_NUMERALS]] \n
+			    set didLocaleNumerals 1
+			}
+		    }
+		    g {			# Two-digit year relative to ISO8601
+					# week number
+			append formatString %02d
+			append substituents \
+			    { [expr { [dict get $date iso8601Year] % 100 }]}
+		    }
+		    G {			# Four-digit year relative to ISO8601
+					# week number
+			append formatString %02d
+			append substituents { [dict get $date iso8601Year]}
+		    }
+		    H {			# Hour in the 24-hour day, leading zero
+			append formatString %02d
+			append substituents \
+			    { [expr { [dict get $date localSeconds] \
+					  / 3600 % 24}]}
+		    }
+		    I {			# Hour AM/PM, with leading zero
+			append formatString %02d
+			append substituents \
+			    { [expr { ( ( ( [dict get $date localSeconds] \
+					    % 86400 ) \
+					  + 86400 \
+					  - 3600 ) \
+					/ 3600 ) \
+				      % 12 + 1 }] }
+		    }
+		    j {			# Day of year (001-366)
+			append formatString %03d
+			append substituents { [dict get $date dayOfYear]}
+		    }
+		    J {			# Julian Day Number
+			append formatString %07ld
+			append substituents { [dict get $date julianDay]}
+		    }
+		    k {			# Hour (0-23), no leading zero
+			append formatString %2d
+			append substituents \
+			    { [expr { [dict get $date localSeconds]
+				      / 3600
+				      % 24 }]}
+		    }
+		    l {			# Hour (12-11), no leading zero
+			append formatString %2d
+			append substituents \
+			    { [expr { ( ( ( [dict get $date localSeconds]
+					   % 86400 )
+					 + 86400
+					 - 3600 )
+				       / 3600 )
+				     % 12 + 1 }]}
+		    }
+		    m {			# Month number, leading zero
+			append formatString %02d
+			append substituents { [dict get $date month]}
+		    }
+		    M {			# Minute of the hour, leading zero
+			append formatString %02d
+			append substituents \
+			    { [expr { [dict get $date localSeconds]
+				      / 60
+				      % 60 }]}
+		    }
+		    n {			# A literal newline
+			append formatString \n
+		    }
+		    N {			# Month number, no leading zero
+			append formatString %2d
+			append substituents { [dict get $date month]}
+		    }
+		    O {			# A format group in the locale's
+					# alternative numerals
+			set state percentO
+			if {!$didLocaleNumerals} {
+			    append preFormatCode \
+				[list set localeNumerals \
+				     [mc LOCALE_NUMERALS]] \n
+			    set didLocaleNumerals 1
+			}
+		    }
+		    p {			# Localized 'AM' or 'PM' indicator
+					# converted to uppercase
+			append formatString %s
+			append preFormatCode \
+			    [list set AM [string toupper [mc AM]]] \n \
+			    [list set PM [string toupper [mc PM]]] \n
+			append substituents \
+			    { [expr {(([dict get $date localSeconds]
+				       % 86400) < 43200) ?
+				     $AM : $PM}]}
+		    }
+		    P {			# Localized 'AM' or 'PM' indicator
+			append formatString %s
+			append preFormatCode \
+			    [list set am [mc AM]] \n \
+			    [list set pm [mc PM]] \n
+			append substituents \
+			    { [expr {(([dict get $date localSeconds]
+				       % 86400) < 43200) ?
+				     $am : $pm}]}
+		    }
+		    Q {			# Hi, Jeff!
+			append formatString %s
+			append substituents { [FormatStarDate $date]}
+		    }
+		    s {			# Seconds from the Posix Epoch
+			append formatString %s
+			append substituents { [dict get $date seconds]}
+		    }
+		    S {			# Second of the minute, with
+			# leading zero
+			append formatString %02d
+			append substituents \
+			    { [expr { [dict get $date localSeconds]
+				      % 60 }]}
+		    }
+		    t {			# A literal tab character
+			append formatString \t
+		    }
+		    u {			# Day of the week (1-Monday, 7-Sunday)
+			append formatString %1d
+			append substituents { [dict get $date dayOfWeek]}
+		    }
+		    U {			# Week of the year (00-53). The
+					# first Sunday of the year is the
+					# first day of week 01
+			append formatString %02d
+			append preFormatCode {
+			    set dow [dict get $date dayOfWeek]
+			    if { $dow == 7 } {
+				set dow 0
+			    }
+			    incr dow
+			    set UweekNumber \
+				[expr { ( [dict get $date dayOfYear]
+					  - $dow + 7 )
+					/ 7 }]
+			}
+			append substituents { $UweekNumber}
+		    }
+		    V {			# The ISO8601 week number
+			append formatString %02d
+			append substituents { [dict get $date iso8601Week]}
+		    }
+		    w {			# Day of the week (0-Sunday,
+					# 6-Saturday)
+			append formatString %1d
+			append substituents \
+			    { [expr { [dict get $date dayOfWeek] % 7 }]}
+		    }
+		    W {			# Week of the year (00-53). The first
+					# Monday of the year is the first day
+					# of week 01.
+			append preFormatCode {
+			    set WweekNumber \
+				[expr { ( [dict get $date dayOfYear]
+					  - [dict get $date dayOfWeek]
+					  + 7 )
+					/ 7 }]
+			}
+			append formatString %02d
+			append substituents { $WweekNumber}
+		    }
+		    y {			# The two-digit year of the century
+			append formatString %02d
+			append substituents \
+			    { [expr { [dict get $date year] % 100 }]}
+		    }
+		    Y {			# The four-digit year
+			append formatString %04d
+			append substituents { [dict get $date year]}
+		    }
+		    z {			# The time zone as hours and minutes
+					# east (+) or west (-) of Greenwich
+			append formatString %s
+			append substituents { [FormatNumericTimeZone \
+						   [dict get $date tzOffset]]}
+		    }
+		    Z {			# The name of the time zone
+			append formatString %s
+			append substituents { [dict get $date tzName]}
+		    }
+		    % {			# A literal percent character
+			append formatString %%
+		    }
+		    default {		# An unknown escape sequence
+			append formatString %% $char
+		    }
+		}
+	    }
+	    percentE {			# Character following %E
+		set state {}
+		switch -exact -- $char {
+		    E {
+			append formatString %s
+			append substituents { } \
+			    [string map \
+				 [list @BCE@ [list [mc BCE]] \
+				      @CE@ [list [mc CE]]] \
+				      {[dict get {BCE @BCE@ CE @CE@} \
+					    [dict get $date era]]}]
+		    }
+		    C {			# Locale-dependent era
+			append formatString %s
+			append substituents { [dict get $date localeEra]}
+		    }
+		    y {			# Locale-dependent year of the era
+			append preFormatCode {
+			    set y [dict get $date localeYear]
+			    if { $y >= 0 && $y < 100 } {
+				set Eyear [lindex $localeNumerals $y]
+			    } else {
+				set Eyear $y
+			    }
+			}
+			append formatString %s
+			append substituents { $Eyear}
+		    }
+		    default {		# Unknown %E format group
+			append formatString %%E $char
+		    }
+		}
+	    }
+	    percentO {			# Character following %O
+		set state {}
+		switch -exact -- $char {
+		    d - e {		# Day of the month in alternative
+			# numerals
+			append formatString %s
+			append substituents \
+			    { [lindex $localeNumerals \
+				   [dict get $date dayOfMonth]]}
+		    }
+		    H - k {		# Hour of the day in alternative
+					# numerals
+			append formatString %s
+			append substituents \
+			    { [lindex $localeNumerals \
+				   [expr { [dict get $date localSeconds]
+					   / 3600
+					   % 24 }]]}
+		    }
+		    I - l {		# Hour (12-11) AM/PM in alternative
+					# numerals
+			append formatString %s
+			append substituents \
+			    { [lindex $localeNumerals \
+				   [expr { ( ( ( [dict get $date localSeconds]
+						 % 86400 )
+					       + 86400
+					       - 3600 )
+					     / 3600 )
+					   % 12 + 1 }]]}
+		    }
+		    m {			# Month number in alternative numerals
+			append formatString %s
+			append substituents \
+			    { [lindex $localeNumerals [dict get $date month]]}
+		    }
+		    M {			# Minute of the hour in alternative
+					# numerals
+			append formatString %s
+			append substituents \
+			    { [lindex $localeNumerals \
+				   [expr { [dict get $date localSeconds]
+					   / 60
+					   % 60 }]]}
+		    }
+		    S {			# Second of the minute in alternative
+					# numerals
+			append formatString %s
+			append substituents \
+			    { [lindex $localeNumerals \
+				   [expr { [dict get $date localSeconds]
+					   % 60 }]]}
+		    }
+		    u {			# Day of the week (Monday=1,Sunday=7)
+					# in alternative numerals
+			append formatString %s
+			append substituents \
+			    { [lindex $localeNumerals \
+				   [dict get $date dayOfWeek]]}
+			}
+		    w {			# Day of the week (Sunday=0,Saturday=6)
+					# in alternative numerals
+			append formatString %s
+			append substituents \
+			    { [lindex $localeNumerals \
+				   [expr { [dict get $date dayOfWeek] % 7 }]]}
+		    }
+		    y {			# Year of the century in alternative
+					# numerals
+			append formatString %s
+			append substituents \
+			    { [lindex $localeNumerals \
+				   [expr { [dict get $date year] % 100 }]]}
+		    }
+		    default {	# Unknown format group
+			append formatString %%O $char
+		    }
+		}
+	    }
+	}
+}
+# Clean up any improperly terminated groups
+switch -exact -- $state {
+	percent {
+	    append formatString %%
+	}
+	percentE {
+	    append retval %%E
+	}
+	percentO {
+	    append retval %%O
+	}
+}
+proc $procName {clockval timezone} "
+$preFormatCode
+return \[::format [list $formatString] $substituents\]
+"
+#    puts [list $procName [info args $procName] [info body $procName]]
+return $procName
+}
+#----------------------------------------------------------------------
+#
+# clock scan --
+#
+#	Inputs a count of seconds since the Posix Epoch as a time of day.
+#
+# The 'clock format' command scans times of day on input.  Refer to the user
+# documentation to see what it does.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::scan { args } {
+set format {}
+# Check the count of args
+if { [llength $args] < 1 || [llength $args] % 2 != 1 } {
+	set cmdName "clock scan"
+	return -code error \
+	    -errorcode [list CLOCK wrongNumArgs] \
+	    "wrong \# args: should be\
+\"$cmdName string\
+?-base seconds?\
+?-format string? ?-gmt boolean?\
+?-locale LOCALE? ?-timezone ZONE?\""
+}
+# Set defaults
+set base [clock seconds]
+set string [lindex $args 0]
+set format {}
+set gmt 0
+set locale c
+set timezone [GetSystemTimeZone]
+# Pick up command line options.
+foreach { flag value } [lreplace $args 0 0] {
+	set saw($flag) {}
+	switch -exact -- $flag {
+	    -b - -ba - -bas - -base {
+		set base $value
+	    }
+	    -f - -fo - -for - -form - -forma - -format {
+		set format $value
+	    }
+	    -g - -gm - -gmt {
+		set gmt $value
+	    }
+	    -l - -lo - -loc - -loca - -local - -locale {
+		set locale [string tolower $value]
+	    }
+	    -t - -ti - -tim - -time - -timez - -timezo - -timezon - -timezone {
+		set timezone $value
+	    }
+	    default {
+		return -code error \
+		    -errorcode [list CLOCK badOption $flag] \
+		    "bad option \"$flag\",\
+must be -base, -format, -gmt, -locale or -timezone"
+	    }
+	}
+}
+# Check options for validity
+if { [info exists saw(-gmt)] && [info exists saw(-timezone)] } {
+	return -code error \
+	    -errorcode [list CLOCK gmtWithTimezone] \
+	    "cannot use -gmt and -timezone in same call"
+}
+if { [catch { expr { wide($base) } } result] } {
+	return -code error "expected integer but got \"$base\""
+}
+if { ![string is boolean -strict $gmt] } {
+	return -code error "expected boolean value but got \"$gmt\""
+} elseif { $gmt } {
+	set timezone :GMT
+}
+if { ![info exists saw(-format)] } {
+	# Perhaps someday we'll localize the legacy code. Right now, it's not
+	# localized.
+	if { [info exists saw(-locale)] } {
+	    return -code error \
+		-errorcode [list CLOCK flagWithLegacyFormat] \
+		"legacy \[clock scan\] does not support -locale"
+	}
+	return [FreeScan $string $base $timezone $locale]
+}
+# Change locale if a fresh locale has been given on the command line.
+EnterLocale $locale
+try {
+	# Map away the locale-dependent composite format groups
+	set scanner [ParseClockScanFormat $format $locale]
+	return [$scanner $string $base $timezone]
+} trap CLOCK {result opts} {
+	# Conceal location of generation of expected errors
+	dict unset opts -errorinfo
+	return -options $opts $result
+}
+}
+#----------------------------------------------------------------------
+#
+# FreeScan --
+#
+#	Scans a time in free format
+#
+# Parameters:
+#	string - String containing the time to scan
+#	base - Base time, expressed in seconds from the Epoch
+#	timezone - Default time zone in which the time will be expressed
+#	locale - (Unused) Name of the locale where the time will be scanned.
+#
+# Results:
+#	Returns the date and time extracted from the string in seconds from
+#	the epoch
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::FreeScan { string base timezone locale } {
+variable TZData
+# Get the data for time changes in the given zone
+try {
+	SetupTimeZone $timezone
+} on error {retval opts} {
+	dict unset opts -errorinfo
+	return -options $opts $retval
+}
+# Extract year, month and day from the base time for the parser to use as
+# defaults
+set date [GetDateFields $base $TZData($timezone) 2361222]
+dict set date secondOfDay [expr {
+	[dict get $date localSeconds] % 86400
+}]
+# Parse the date.  The parser will return a list comprising date, time,
+# time zone, relative month/day/seconds, relative weekday, ordinal month.
+try {
+	set scanned [Oldscan $string \
+		     [dict get $date year] \
+		     [dict get $date month] \
+		     [dict get $date dayOfMonth]]
+	lassign $scanned \
+	    parseDate parseTime parseZone parseRel \
+	    parseWeekday parseOrdinalMonth
+} on error message {
+	return -code error \
+	    "unable to convert date-time string \"$string\": $message"
+}
+# If the caller supplied a date in the string, update the 'date' dict with
+# the value. If the caller didn't specify a time with the date, default to
+# midnight.
+if { [llength $parseDate] > 0 } {
+	lassign $parseDate y m d
+	if { $y < 100 } {
+	    if { $y >= 39 } {
+		incr y 1900
+	    } else {
+		incr y 2000
+	    }
+	}
+	dict set date era CE
+	dict set date year $y
+	dict set date month $m
+	dict set date dayOfMonth $d
+	if { $parseTime eq {} } {
+	    set parseTime 0
+	}
+}
+# If the caller supplied a time zone in the string, it comes back as a
+# two-element list; the first element is the number of minutes east of
+# Greenwich, and the second is a Daylight Saving Time indicator (1 == yes,
+# 0 == no, -1 == unknown). We make it into a time zone indicator of
+# +-hhmm.
+if { [llength $parseZone] > 0 } {
+	lassign $parseZone minEast dstFlag
+	set timezone [FormatNumericTimeZone \
+			  [expr { 60 * $minEast + 3600 * $dstFlag }]]
+	SetupTimeZone $timezone
+}
+dict set date tzName $timezone
+# Assemble date, time, zone into seconds-from-epoch
+set date [GetJulianDayFromEraYearMonthDay $date[set date {}] 2361222]
+if { $parseTime ne {} } {
+	dict set date secondOfDay $parseTime
+} elseif { [llength $parseWeekday] != 0
+	       || [llength $parseOrdinalMonth] != 0
+	       || ( [llength $parseRel] != 0
+		    && ( [lindex $parseRel 0] != 0
+			 || [lindex $parseRel 1] != 0 ) ) } {
+	dict set date secondOfDay 0
+}
+dict set date localSeconds [expr {
+	-210866803200
+	+ ( 86400 * wide([dict get $date julianDay]) )
+	+ [dict get $date secondOfDay]
+}]
+dict set date tzName $timezone
+set date [ConvertLocalToUTC $date[set date {}] $TZData($timezone) 2361222]
+set seconds [dict get $date seconds]
+# Do relative times
+if { [llength $parseRel] > 0 } {
+	lassign $parseRel relMonth relDay relSecond
+	set seconds [add $seconds \
+			 $relMonth months $relDay days $relSecond seconds \
+			 -timezone $timezone -locale $locale]
+}
+# Do relative weekday
+if { [llength $parseWeekday] > 0 } {
+	lassign $parseWeekday dayOrdinal dayOfWeek
+	set date2 [GetDateFields $seconds $TZData($timezone) 2361222]
+	dict set date2 era CE
+	set jdwkday [WeekdayOnOrBefore $dayOfWeek [expr {
+	    [dict get $date2 julianDay] + 6
+	}]]
+	incr jdwkday [expr { 7 * $dayOrdinal }]
+	if { $dayOrdinal > 0 } {
+	    incr jdwkday -7
+	}
+	dict set date2 secondOfDay \
+	    [expr { [dict get $date2 localSeconds] % 86400 }]
+	dict set date2 julianDay $jdwkday
+	dict set date2 localSeconds [expr {
+	    -210866803200
+	    + ( 86400 * wide([dict get $date2 julianDay]) )
+	    + [dict get $date secondOfDay]
+	}]
+	dict set date2 tzName $timezone
+	set date2 [ConvertLocalToUTC $date2[set date2 {}] $TZData($timezone) \
+		       2361222]
+	set seconds [dict get $date2 seconds]
+}
+# Do relative month
+if { [llength $parseOrdinalMonth] > 0 } {
+	lassign $parseOrdinalMonth monthOrdinal monthNumber
+	if { $monthOrdinal > 0 } {
+	    set monthDiff [expr { $monthNumber - [dict get $date month] }]
+	    if { $monthDiff <= 0 } {
+		incr monthDiff 12
+	    }
+	    incr monthOrdinal -1
+	} else {
+	    set monthDiff [expr { [dict get $date month] - $monthNumber }]
+	    if { $monthDiff >= 0 } {
+		incr monthDiff -12
+	    }
+	    incr monthOrdinal
+	}
+	set seconds [add $seconds $monthOrdinal years $monthDiff months \
+			 -timezone $timezone -locale $locale]
+}
+return $seconds
+}
+#----------------------------------------------------------------------
+#
+# ParseClockScanFormat --
+#
+#	Parses a format string given to [clock scan -format]
+#
+# Parameters:
+#	formatString - The format being parsed
+#	locale - The current locale
+#
+# Results:
+#	Constructs and returns a procedure that accepts the string being
+#	scanned, the base time, and the time zone.  The procedure will either
+#	return the scanned time or else throw an error that should be rethrown
+#	to the caller of [clock scan]
+#
+# Side effects:
+#	The given procedure is defined in the ::tcl::clock namespace.  Scan
+#	procedures are not deleted once installed.
+#
+# Why do we parse dates by defining a procedure to parse them?  The reason is
+# that by doing so, we have one convenient place to cache all the information:
+# the regular expressions that match the patterns (which will be compiled),
+# the code that assembles the date information, everything lands in one place.
+# In this way, when a given format is reused at run time, all the information
+# of how to apply it is available in a single place.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ParseClockScanFormat {formatString locale} {
+# Check whether the format has been parsed previously, and return the
+# existing recognizer if it has.
+set procName scanproc'$formatString'$locale
+set procName [namespace current]::[string map {: {\:} \\ {\\}} $procName]
+if { [namespace which $procName] != {} } {
+	return $procName
+}
+variable DateParseActions
+variable TimeParseActions
+# Localize the %x, %X, etc. groups
+set formatString [LocalizeFormat $locale $formatString]
+# Condense whitespace
+regsub -all {[[:space:]]+} $formatString { } formatString
+# Walk through the groups of the format string.  In this loop, we
+# accumulate:
+#	- a regular expression that matches the string,
+#   - the count of capturing brackets in the regexp
+#   - a set of code that post-processes the fields captured by the regexp,
+#   - a dictionary whose keys are the names of fields that are present
+#     in the format string.
+set re {^[[:space:]]*}
+set captureCount 0
+set postcode {}
+set fieldSet [dict create]
+set fieldCount 0
+set postSep {}
+set state {}
+foreach c [split $formatString {}] {
+	switch -exact -- $state {
+	    {} {
+		if { $c eq "%" } {
+		    set state %
+		} elseif { $c eq " " } {
+		    append re {[[:space:]]+}
+		} else {
+		    if { ! [string is alnum $c] } {
+			append re "\\"
+		    }
+		    append re $c
+		}
+	    }
+	    % {
+		set state {}
+		switch -exact -- $c {
+		    % {
+			append re %
+		    }
+		    { } {
+			append re "\[\[:space:\]\]*"
+		    }
+		    a - A { 		# Day of week, in words
+			set l {}
+			foreach \
+			    i {7 1 2 3 4 5 6} \
+			    abr [mc DAYS_OF_WEEK_ABBREV] \
+			    full [mc DAYS_OF_WEEK_FULL] {
+				dict set l [string tolower $abr] $i
+				dict set l [string tolower $full] $i
+				incr i
+			    }
+			lassign [UniquePrefixRegexp $l] regex lookup
+			append re ( $regex )
+			dict set fieldSet dayOfWeek [incr fieldCount]
+			append postcode "dict set date dayOfWeek \[" \
+			    "dict get " [list $lookup] " " \
+			    \[ {string tolower $field} [incr captureCount] \] \
+			    "\]\n"
+		    }
+		    b - B - h {		# Name of month
+			set i 0
+			set l {}
+			foreach \
+			    abr [mc MONTHS_ABBREV] \
+			    full [mc MONTHS_FULL] {
+				incr i
+				dict set l [string tolower $abr] $i
+				dict set l [string tolower $full] $i
+			    }
+			lassign [UniquePrefixRegexp $l] regex lookup
+			append re ( $regex )
+			dict set fieldSet month [incr fieldCount]
+			append postcode "dict set date month \[" \
+			    "dict get " [list $lookup] \
+			    " " \[ {string tolower $field} \
+			    [incr captureCount] \] \
+			    "\]\n"
+		    }
+		    C {			# Gregorian century
+			append re \\s*(\\d\\d?)
+			dict set fieldSet century [incr fieldCount]
+			append postcode "dict set date century \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    d - e {		# Day of month
+			append re \\s*(\\d\\d?)
+			dict set fieldSet dayOfMonth [incr fieldCount]
+			append postcode "dict set date dayOfMonth \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    E {			# Prefix for locale-specific codes
+			set state %E
+		    }
+		    g {			# ISO8601 2-digit year
+			append re \\s*(\\d\\d)
+			dict set fieldSet iso8601YearOfCentury \
+			    [incr fieldCount]
+			append postcode \
+			    "dict set date iso8601YearOfCentury \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    G {			# ISO8601 4-digit year
+			append re \\s*(\\d\\d)(\\d\\d)
+			dict set fieldSet iso8601Century [incr fieldCount]
+			dict set fieldSet iso8601YearOfCentury \
+			    [incr fieldCount]
+			append postcode \
+			    "dict set date iso8601Century \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n" \
+			    "dict set date iso8601YearOfCentury \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    H - k {		# Hour of day
+			append re \\s*(\\d\\d?)
+			dict set fieldSet hour [incr fieldCount]
+			append postcode "dict set date hour \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    I - l {		# Hour, AM/PM
+			append re \\s*(\\d\\d?)
+			dict set fieldSet hourAMPM [incr fieldCount]
+			append postcode "dict set date hourAMPM \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    j {			# Day of year
+			append re \\s*(\\d\\d?\\d?)
+			dict set fieldSet dayOfYear [incr fieldCount]
+			append postcode "dict set date dayOfYear \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    J {			# Julian Day Number
+			append re \\s*(\\d+)
+			dict set fieldSet julianDay [incr fieldCount]
+			append postcode "dict set date julianDay \[" \
+			    "::scan \$field" [incr captureCount] " %ld" \
+			    "\]\n"
+		    }
+		    m - N {		# Month number
+			append re \\s*(\\d\\d?)
+			dict set fieldSet month [incr fieldCount]
+			append postcode "dict set date month \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    M {			# Minute
+			append re \\s*(\\d\\d?)
+			dict set fieldSet minute [incr fieldCount]
+			append postcode "dict set date minute \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    n {			# Literal newline
+			append re \\n
+		    }
+		    O {			# Prefix for locale numerics
+			set state %O
+		    }
+		    p - P { 		# AM/PM indicator
+			set l [list [string tolower [mc AM]] 0 \
+				   [string tolower [mc PM]] 1]
+			lassign [UniquePrefixRegexp $l] regex lookup
+			append re ( $regex )
+			dict set fieldSet amPmIndicator [incr fieldCount]
+			append postcode "dict set date amPmIndicator \[" \
+			    "dict get " [list $lookup] " \[string tolower " \
+			    "\$field" \
+			    [incr captureCount] \
+			    "\]\]\n"
+		    }
+		    Q {			# Hi, Jeff!
+			append re {Stardate\s+([-+]?\d+)(\d\d\d)[.](\d)}
+			incr captureCount
+			dict set fieldSet seconds [incr fieldCount]
+			append postcode {dict set date seconds } \[ \
+			    {ParseStarDate $field} [incr captureCount] \
+			    { $field} [incr captureCount] \
+			    { $field} [incr captureCount] \
+			    \] \n
+		    }
+		    s {			# Seconds from Posix Epoch
+			# This next case is insanely difficult, because it's
+			# problematic to determine whether the field is
+			# actually within the range of a wide integer.
+			append re {\s*([-+]?\d+)}
+			dict set fieldSet seconds [incr fieldCount]
+			append postcode {dict set date seconds } \[ \
+			    {ScanWide $field} [incr captureCount] \] \n
+		    }
+		    S {			# Second
+			append re \\s*(\\d\\d?)
+			dict set fieldSet second [incr fieldCount]
+			append postcode "dict set date second \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    t {			# Literal tab character
+			append re \\t
+		    }
+		    u - w {		# Day number within week, 0 or 7 == Sun
+					# 1=Mon, 6=Sat
+			append re \\s*(\\d)
+			dict set fieldSet dayOfWeek [incr fieldCount]
+			append postcode {::scan $field} [incr captureCount] \
+			    { %d dow} \n \
+			    {
+				if { $dow == 0 } {
+				    set dow 7
+				} elseif { $dow > 7 } {
+				    return -code error \
+					-errorcode [list CLOCK badDayOfWeek] \
+					"day of week is greater than 7"
+				}
+				dict set date dayOfWeek $dow
+			    }
+		    }
+		    U {			# Week of year. The first Sunday of
+					# the year is the first day of week
+					# 01. No scan rule uses this group.
+			append re \\s*\\d\\d?
+		    }
+		    V {			# Week of ISO8601 year
+			append re \\s*(\\d\\d?)
+			dict set fieldSet iso8601Week [incr fieldCount]
+			append postcode "dict set date iso8601Week \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    W {			# Week of the year (00-53). The first
+					# Monday of the year is the first day
+					# of week 01. No scan rule uses this
+					# group.
+			append re \\s*\\d\\d?
+		    }
+		    y {			# Two-digit Gregorian year
+			append re \\s*(\\d\\d?)
+			dict set fieldSet yearOfCentury [incr fieldCount]
+			append postcode "dict set date yearOfCentury \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    Y {			# 4-digit Gregorian year
+			append re \\s*(\\d\\d)(\\d\\d)
+			dict set fieldSet century [incr fieldCount]
+			dict set fieldSet yearOfCentury [incr fieldCount]
+			append postcode \
+			    "dict set date century \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n" \
+			    "dict set date yearOfCentury \[" \
+			    "::scan \$field" [incr captureCount] " %d" \
+			    "\]\n"
+		    }
+		    z - Z {			# Time zone name
+			append re {(?:([-+]\d\d(?::?\d\d(?::?\d\d)?)?)|([[:alnum:]]{1,4}))}
+			dict set fieldSet tzName [incr fieldCount]
+			append postcode \
+			    {if } \{ { $field} [incr captureCount] \
+			    { ne "" } \} { } \{ \n \
+			    {dict set date tzName $field} \
+			    $captureCount \n \
+			    \} { else } \{ \n \
+			    {dict set date tzName } \[ \
+			    {ConvertLegacyTimeZone $field} \
+			    [incr captureCount] \] \n \
+			    \} \n \
+		    }
+		    % {			# Literal percent character
+			append re %
+		    }
+		    default {
+			append re %
+			if { ! [string is alnum $c] } {
+			    append re \\
+			    }
+			append re $c
+		    }
+		}
+	    }
+	    %E {
+		switch -exact -- $c {
+		    C {			# Locale-dependent era
+			set d {}
+			foreach triple [mc LOCALE_ERAS] {
+			    lassign $triple t symbol year
+			    dict set d [string tolower $symbol] $year
+			}
+			lassign [UniquePrefixRegexp $d] regex lookup
+			append re (?: $regex )
+		    }
+		    E {
+			set l {}
+			dict set l [string tolower [mc BCE]] BCE
+			dict set l [string tolower [mc CE]] CE
+			dict set l b.c.e. BCE
+			dict set l c.e. CE
+			dict set l b.c. BCE
+			dict set l a.d. CE
+			lassign [UniquePrefixRegexp $l] regex lookup
+			append re ( $regex )
+			dict set fieldSet era [incr fieldCount]
+			append postcode "dict set date era \["\
+			    "dict get " [list $lookup] \
+			    { } \[ {string tolower $field} \
+			    [incr captureCount] \] \
+			    "\]\n"
+		    }
+		    y {			# Locale-dependent year of the era
+			lassign [LocaleNumeralMatcher $locale] regex lookup
+			append re $regex
+			incr captureCount
+		    }
+		    default {
+			append re %E
+			if { ! [string is alnum $c] } {
+			    append re \\
+			    }
+			append re $c
+		    }
+		}
+		set state {}
+	    }
+	    %O {
+		switch -exact -- $c {
+		    d - e {
+			lassign [LocaleNumeralMatcher $locale] regex lookup
+			append re $regex
+			dict set fieldSet dayOfMonth [incr fieldCount]
+			append postcode "dict set date dayOfMonth \[" \
+			    "dict get " [list $lookup] " \$field" \
+			    [incr captureCount] \
+			    "\]\n"
+		    }
+		    H - k {
+			lassign [LocaleNumeralMatcher $locale] regex lookup
+			append re $regex
+			dict set fieldSet hour [incr fieldCount]
+			append postcode "dict set date hour \[" \
+			    "dict get " [list $lookup] " \$field" \
+			    [incr captureCount] \
+			    "\]\n"
+		    }
+		    I - l {
+			lassign [LocaleNumeralMatcher $locale] regex lookup
+			append re $regex
+			dict set fieldSet hourAMPM [incr fieldCount]
+			append postcode "dict set date hourAMPM \[" \
+			    "dict get " [list $lookup] " \$field" \
+			    [incr captureCount] \
+			    "\]\n"
+		    }
+		    m {
+			lassign [LocaleNumeralMatcher $locale] regex lookup
+			append re $regex
+			dict set fieldSet month [incr fieldCount]
+			append postcode "dict set date month \[" \
+			    "dict get " [list $lookup] " \$field" \
+			    [incr captureCount] \
+			    "\]\n"
+		    }
+		    M {
+			lassign [LocaleNumeralMatcher $locale] regex lookup
+			append re $regex
+			dict set fieldSet minute [incr fieldCount]
+			append postcode "dict set date minute \[" \
+			    "dict get " [list $lookup] " \$field" \
+			    [incr captureCount] \
+			    "\]\n"
+		    }
+		    S {
+			lassign [LocaleNumeralMatcher $locale] regex lookup
+			append re $regex
+			dict set fieldSet second [incr fieldCount]
+			append postcode "dict set date second \[" \
+			    "dict get " [list $lookup] " \$field" \
+			    [incr captureCount] \
+			    "\]\n"
+		    }
+		    u - w {
+			lassign [LocaleNumeralMatcher $locale] regex lookup
+			append re $regex
+			dict set fieldSet dayOfWeek [incr fieldCount]
+			append postcode "set dow \[dict get " [list $lookup] \
+			    { $field} [incr captureCount] \] \n \
+			    {
+				if { $dow == 0 } {
+				    set dow 7
+				} elseif { $dow > 7 } {
+				    return -code error \
+					-errorcode [list CLOCK badDayOfWeek] \
+					"day of week is greater than 7"
+				}
+				dict set date dayOfWeek $dow
+			    }
+		    }
+		    y {
+			lassign [LocaleNumeralMatcher $locale] regex lookup
+			append re $regex
+			dict set fieldSet yearOfCentury [incr fieldCount]
+			append postcode {dict set date yearOfCentury } \[ \
+			    {dict get } [list $lookup] { $field} \
+			    [incr captureCount] \] \n
+		    }
+		    default {
+			append re %O
+			if { ! [string is alnum $c] } {
+			    append re \\
+			    }
+			append re $c
+		    }
+		}
+		set state {}
+	    }
+	}
+}
+# Clean up any unfinished format groups
+append re $state \\s*\$
+# Build the procedure
+set procBody {}
+append procBody "variable ::tcl::clock::TZData" \n
+append procBody "if \{ !\[ regexp -nocase [list $re] \$string ->"
+for { set i 1 } { $i <= $captureCount } { incr i } {
+	append procBody " " field $i
+}
+append procBody "\] \} \{" \n
+append procBody {
+	return -code error -errorcode [list CLOCK badInputString] \
+	    {input string does not match supplied format}
+}
+append procBody \}\n
+append procBody "set date \[dict create\]" \n
+append procBody {dict set date tzName $timeZone} \n
+append procBody $postcode
+append procBody [list set changeover [mc GREGORIAN_CHANGE_DATE]] \n
+# Set up the time zone before doing anything with a default base date
+# that might need a timezone to interpret it.
+if { ![dict exists $fieldSet seconds]
+	    && ![dict exists $fieldSet starDate] } {
+	if { [dict exists $fieldSet tzName] } {
+	    append procBody {
+		set timeZone [dict get $date tzName]
+	    }
+	}
+	append procBody {
+	    ::tcl::clock::SetupTimeZone $timeZone
+	}
+}
+# Add code that gets Julian Day Number from the fields.
+append procBody [MakeParseCodeFromFields $fieldSet $DateParseActions]
+# Get time of day
+append procBody [MakeParseCodeFromFields $fieldSet $TimeParseActions]
+# Assemble seconds from the Julian day and second of the day.
+# Convert to local time unless epoch seconds or stardate are
+# being processed - they're always absolute
+if { ![dict exists $fieldSet seconds]
+&& ![dict exists $fieldSet starDate] } {
+	append procBody {
+	    if { [dict get $date julianDay] > 5373484 } {
+		return -code error -errorcode [list CLOCK dateTooLarge] \
+		    "requested date too large to represent"
+	    }
+	    dict set date localSeconds [expr {
+		-210866803200
+		+ ( 86400 * wide([dict get $date julianDay]) )
+		+ [dict get $date secondOfDay]
+	    }]
+	}
+	# Finally, convert the date to local time
+	append procBody {
+	    set date [::tcl::clock::ConvertLocalToUTC $date[set date {}] \
+			  $TZData($timeZone) $changeover]
+	}
+}
+# Return result
+append procBody {return [dict get $date seconds]} \n
+proc $procName { string baseTime timeZone } $procBody
+# puts [list proc $procName [list string baseTime timeZone] $procBody]
+return $procName
+}
+#----------------------------------------------------------------------
+#
+# LocaleNumeralMatcher --
+#
+#	Composes a regexp that captures the numerals in the given locale, and
+#	a dictionary to map them to conventional numerals.
+#
+# Parameters:
+#	locale - Name of the current locale
+#
+# Results:
+#	Returns a two-element list comprising the regexp and the dictionary.
+#
+# Side effects:
+#	Caches the result.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::LocaleNumeralMatcher {l} {
+variable LocaleNumeralCache
+if { ![dict exists $LocaleNumeralCache $l] } {
+	set d {}
+	set i 0
+	set sep \(
+	foreach n [mc LOCALE_NUMERALS] {
+	    dict set d $n $i
+	    regsub -all {[^[:alnum:]]} $n \\\\& subex
+	    append re $sep $subex
+	    set sep |
+	    incr i
+	}
+	append re \)
+	dict set LocaleNumeralCache $l [list $re $d]
+}
+return [dict get $LocaleNumeralCache $l]
+}
+#----------------------------------------------------------------------
+#
+# UniquePrefixRegexp --
+#
+#	Composes a regexp that performs unique-prefix matching.  The RE
+#	matches one of a supplied set of strings, or any unique prefix
+#	thereof.
+#
+# Parameters:
+#	data - List of alternating match-strings and values.
+#	       Match-strings with distinct values are considered
+#	       distinct.
+#
+# Results:
+#	Returns a two-element list.  The first is a regexp that matches any
+#	unique prefix of any of the strings.  The second is a dictionary whose
+#	keys are match values from the regexp and whose values are the
+#	corresponding values from 'data'.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::UniquePrefixRegexp { data } {
+# The 'successors' dictionary will contain, for each string that is a
+# prefix of any key, all characters that may follow that prefix.  The
+# 'prefixMapping' dictionary will have keys that are prefixes of keys and
+# values that correspond to the keys.
+set prefixMapping [dict create]
+set successors [dict create {} {}]
+# Walk the key-value pairs
+foreach { key value } $data {
+	# Construct all prefixes of the key;
+	set prefix {}
+	foreach char [split $key {}] {
+	    set oldPrefix $prefix
+	    dict set successors $oldPrefix $char {}
+	    append prefix $char
+	    # Put the prefixes in the 'prefixMapping' and 'successors'
+	    # dictionaries
+	    dict lappend prefixMapping $prefix $value
+	    if { ![dict exists $successors $prefix] } {
+		dict set successors $prefix {}
+	    }
+	}
+}
+# Identify those prefixes that designate unique values, and those that are
+# the full keys
+set uniquePrefixMapping {}
+dict for { key valueList } $prefixMapping {
+	if { [llength $valueList] == 1 } {
+	    dict set uniquePrefixMapping $key [lindex $valueList 0]
+	}
+}
+foreach { key value } $data {
+	dict set uniquePrefixMapping $key $value
+}
+# Construct the re.
+return [list \
+		[MakeUniquePrefixRegexp $successors $uniquePrefixMapping {}] \
+		$uniquePrefixMapping]
+}
+#----------------------------------------------------------------------
+#
+# MakeUniquePrefixRegexp --
+#
+#	Service procedure for 'UniquePrefixRegexp' that constructs a regular
+#	expresison that matches the unique prefixes.
+#
+# Parameters:
+#	successors - Dictionary whose keys are all prefixes
+#		     of keys passed to 'UniquePrefixRegexp' and whose
+#		     values are dictionaries whose keys are the characters
+#		     that may follow those prefixes.
+#	uniquePrefixMapping - Dictionary whose keys are the unique
+#			      prefixes and whose values are not examined.
+#	prefixString - Current prefix being processed.
+#
+# Results:
+#	Returns a constructed regular expression that matches the set of
+#	unique prefixes beginning with the 'prefixString'.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::MakeUniquePrefixRegexp { successors
+					  uniquePrefixMapping
+					  prefixString } {
+# Get the characters that may follow the current prefix string
+set schars [lsort -ascii [dict keys [dict get $successors $prefixString]]]
+if { [llength $schars] == 0 } {
+	return {}
+}
+# If there is more than one successor character, or if the current prefix
+# is a unique prefix, surround the generated re with non-capturing
+# parentheses.
+set re {}
+if {
+	[dict exists $uniquePrefixMapping $prefixString]
+	|| [llength $schars] > 1
+} then {
+	append re "(?:"
+}
+# Generate a regexp that matches the successors.
+set sep ""
+foreach { c } $schars {
+	set nextPrefix $prefixString$c
+	regsub -all {[^[:alnum:]]} $c \\\\& rechar
+	append re $sep $rechar \
+	    [MakeUniquePrefixRegexp \
+		 $successors $uniquePrefixMapping $nextPrefix]
+	set sep |
+}
+# If the current prefix is a unique prefix, make all following text
+# optional. Otherwise, if there is more than one successor character,
+# close the non-capturing parentheses.
+if { [dict exists $uniquePrefixMapping $prefixString] } {
+	append re ")?"
+} elseif { [llength $schars] > 1 } {
+	append re ")"
+}
+return $re
+}
+#----------------------------------------------------------------------
+#
+# MakeParseCodeFromFields --
+#
+#	Composes Tcl code to extract the Julian Day Number from a dictionary
+#	containing date fields.
+#
+# Parameters:
+#	dateFields -- Dictionary whose keys are fields of the date,
+#	              and whose values are the rightmost positions
+#		      at which those fields appear.
+#	parseActions -- List of triples: field set, priority, and
+#			code to emit.  Smaller priorities are better, and
+#			the list must be in ascending order by priority
+#
+# Results:
+#	Returns a burst of code that extracts the day number from the given
+#	date.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::MakeParseCodeFromFields { dateFields parseActions } {
+set currPrio 999
+set currFieldPos [list]
+set currCodeBurst {
+	error "in ::tcl::clock::MakeParseCodeFromFields: can't happen"
+}
+foreach { fieldSet prio parseAction } $parseActions {
+	# If we've found an answer that's better than any that follow, quit
+	# now.
+	if { $prio > $currPrio } {
+	    break
+	}
+	# Accumulate the field positions that are used in the current field
+	# grouping.
+	set fieldPos [list]
+	set ok true
+	foreach field $fieldSet {
+	    if { ! [dict exists $dateFields $field] } {
+		set ok 0
+		break
+	    }
+	    lappend fieldPos [dict get $dateFields $field]
+	}
+	# Quit if we don't have a complete set of fields
+	if { !$ok } {
+	    continue
+	}
+	# Determine whether the current answer is better than the last.
+	set fPos [lsort -integer -decreasing $fieldPos]
+	if { $prio ==  $currPrio } {
+	    foreach currPos $currFieldPos newPos $fPos {
+		if {
+		    ![string is integer $newPos]
+		    || ![string is integer $currPos]
+		    || $newPos > $currPos
+		} then {
+		    break
+		}
+		if { $newPos < $currPos } {
+		    set ok 0
+		    break
+		}
+	    }
+	}
+	if { !$ok } {
+	    continue
+	}
+	# Remember the best possibility for extracting date information
+	set currPrio $prio
+	set currFieldPos $fPos
+	set currCodeBurst $parseAction
+}
+return $currCodeBurst
+}
+#----------------------------------------------------------------------
+#
+# EnterLocale --
+#
+#	Switch [mclocale] to a given locale if necessary
+#
+# Parameters:
+#	locale -- Desired locale
+#
+# Results:
+#	Returns the locale that was previously current.
+#
+# Side effects:
+#	Does [mclocale].  If necessary, loades the designated locale's files.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::EnterLocale { locale } {
+if { $locale eq {system} } {
+	if { $::tcl_platform(platform) ne {windows} } {
+	    # On a non-windows platform, the 'system' locale is the same as
+	    # the 'current' locale
+	    set locale current
+	} else {
+	    # On a windows platform, the 'system' locale is adapted from the
+	    # 'current' locale by applying the date and time formats from the
+	    # Control Panel.  First, load the 'current' locale if it's not yet
+	    # loaded
+	    mcpackagelocale set [mclocale]
+	    # Make a new locale string for the system locale, and get the
+	    # Control Panel information
+	    set locale [mclocale]_windows
+	    if { ! [mcpackagelocale present $locale] } {
+		LoadWindowsDateTimeFormats $locale
+	    }
+	}
+}
+if { $locale eq {current}} {
+	set locale [mclocale]
+}
+# Eventually load the locale
+mcpackagelocale set $locale
+}
+#----------------------------------------------------------------------
+#
+# LoadWindowsDateTimeFormats --
+#
+#	Load the date/time formats from the Control Panel in Windows and
+#	convert them so that they're usable by Tcl.
+#
+# Parameters:
+#	locale - Name of the locale in whose message catalog
+#	         the converted formats are to be stored.
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	Updates the given message catalog with the locale strings.
+#
+# Presumes that on entry, [mclocale] is set to the current locale, so that
+# default strings can be obtained if the Registry query fails.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::LoadWindowsDateTimeFormats { locale } {
+# Bail out if we can't find the Registry
+variable NoRegistry
+if { [info exists NoRegistry] } return
+if { ![catch {
+	registry get "HKEY_CURRENT_USER\\Control Panel\\International" \
+	    sShortDate
+} string] } {
+	set quote {}
+	set datefmt {}
+	foreach { unquoted quoted } [split $string '] {
+	    append datefmt $quote [string map {
+		dddd %A
+		ddd  %a
+		dd   %d
+		d    %e
+		MMMM %B
+		MMM  %b
+		MM   %m
+		M    %N
+		yyyy %Y
+		yy   %y
+y    %y
+gg   {}
+	    } $unquoted]
+	    if { $quoted eq {} } {
+		set quote '
+	    } else {
+		set quote $quoted
+	    }
+	}
+	::msgcat::mcset $locale DATE_FORMAT $datefmt
+}
+if { ![catch {
+	registry get "HKEY_CURRENT_USER\\Control Panel\\International" \
+	    sLongDate
+} string] } {
+	set quote {}
+	set ldatefmt {}
+	foreach { unquoted quoted } [split $string '] {
+	    append ldatefmt $quote [string map {
+		dddd %A
+		ddd  %a
+		dd   %d
+		d    %e
+		MMMM %B
+		MMM  %b
+		MM   %m
+		M    %N
+		yyyy %Y
+		yy   %y
+y    %y
+gg   {}
+	    } $unquoted]
+	    if { $quoted eq {} } {
+		set quote '
+	    } else {
+		set quote $quoted
+	    }
+	}
+	::msgcat::mcset $locale LOCALE_DATE_FORMAT $ldatefmt
+}
+if { ![catch {
+	registry get "HKEY_CURRENT_USER\\Control Panel\\International" \
+	    sTimeFormat
+} string] } {
+	set quote {}
+	set timefmt {}
+	foreach { unquoted quoted } [split $string '] {
+	    append timefmt $quote [string map {
+		HH    %H
+		H     %k
+		hh    %I
+		h     %l
+		mm    %M
+		m     %M
+		ss    %S
+		s     %S
+		tt    %p
+		t     %p
+	    } $unquoted]
+	    if { $quoted eq {} } {
+		set quote '
+	    } else {
+		set quote $quoted
+	    }
+	}
+	::msgcat::mcset $locale TIME_FORMAT $timefmt
+}
+catch {
+	::msgcat::mcset $locale DATE_TIME_FORMAT "$datefmt $timefmt"
+}
+catch {
+	::msgcat::mcset $locale LOCALE_DATE_TIME_FORMAT "$ldatefmt $timefmt"
+}
+return
+}
+#----------------------------------------------------------------------
+#
+# LocalizeFormat --
+#
+#	Map away locale-dependent format groups in a clock format.
+#
+# Parameters:
+#	locale -- Current [mclocale] locale, supplied to avoid
+#		  an extra call
+#	format -- Format supplied to [clock scan] or [clock format]
+#
+# Results:
+#	Returns the string with locale-dependent composite format groups
+#	substituted out.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::LocalizeFormat { locale format } {
+# message catalog key to cache this format
+set key FORMAT_$format
+if { [::msgcat::mcexists -exactlocale -exactnamespace $key] } {
+	return [mc $key]
+}
+# Handle locale-dependent format groups by mapping them out of the format
+# string.  Note that the order of the [string map] operations is
+# significant because later formats can refer to later ones; for example
+# %c can refer to %X, which in turn can refer to %T.
+set list {
+	%% %%
+	%D %m/%d/%Y
+	%+ {%a %b %e %H:%M:%S %Z %Y}
+}
+lappend list %EY [string map $list [mc LOCALE_YEAR_FORMAT]]
+lappend list %T  [string map $list [mc TIME_FORMAT_24_SECS]]
+lappend list %R  [string map $list [mc TIME_FORMAT_24]]
+lappend list %r  [string map $list [mc TIME_FORMAT_12]]
+lappend list %X  [string map $list [mc TIME_FORMAT]]
+lappend list %EX [string map $list [mc LOCALE_TIME_FORMAT]]
+lappend list %x  [string map $list [mc DATE_FORMAT]]
+lappend list %Ex [string map $list [mc LOCALE_DATE_FORMAT]]
+lappend list %c  [string map $list [mc DATE_TIME_FORMAT]]
+lappend list %Ec [string map $list [mc LOCALE_DATE_TIME_FORMAT]]
+set format [string map $list $format]
+::msgcat::mcset $locale $key $format
+return $format
+}
+#----------------------------------------------------------------------
+#
+# FormatNumericTimeZone --
+#
+#	Formats a time zone as +hhmmss
+#
+# Parameters:
+#	z - Time zone in seconds east of Greenwich
+#
+# Results:
+#	Returns the time zone formatted in a numeric form
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::FormatNumericTimeZone { z } {
+if { $z < 0 } {
+	set z [expr { - $z }]
+	set retval -
+} else {
+	set retval +
+}
+append retval [::format %02d [expr { $z / 3600 }]]
+set z [expr { $z % 3600 }]
+append retval [::format %02d [expr { $z / 60 }]]
+set z [expr { $z % 60 }]
+if { $z != 0 } {
+	append retval [::format %02d $z]
+}
+return $retval
+}
+#----------------------------------------------------------------------
+#
+# FormatStarDate --
+#
+#	Formats a date as a StarDate.
+#
+# Parameters:
+#	date - Dictionary containing 'year', 'dayOfYear', and
+#	       'localSeconds' fields.
+#
+# Results:
+#	Returns the given date formatted as a StarDate.
+#
+# Side effects:
+#	None.
+#
+# Jeff Hobbs put this in to support an atrocious pun about Tcl being
+# "Enterprise ready."  Now we're stuck with it.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::FormatStarDate { date } {
+variable Roddenberry
+# Get day of year, zero based
+set doy [expr { [dict get $date dayOfYear] - 1 }]
+# Determine whether the year is a leap year
+set lp [IsGregorianLeapYear $date]
+# Convert day of year to a fractional year
+if { $lp } {
+	set fractYear [expr { 1000 * $doy / 366 }]
+} else {
+	set fractYear [expr { 1000 * $doy / 365 }]
+}
+# Put together the StarDate
+return [::format "Stardate %02d%03d.%1d" \
+		[expr { [dict get $date year] - $Roddenberry }] \
+		$fractYear \
+		[expr { [dict get $date localSeconds] % 86400
+			/ ( 86400 / 10 ) }]]
+}
+#----------------------------------------------------------------------
+#
+# ParseStarDate --
+#
+#	Parses a StarDate
+#
+# Parameters:
+#	year - Year from the Roddenberry epoch
+#	fractYear - Fraction of a year specifiying the day of year.
+#	fractDay - Fraction of a day
+#
+# Results:
+#	Returns a count of seconds from the Posix epoch.
+#
+# Side effects:
+#	None.
+#
+# Jeff Hobbs put this in to support an atrocious pun about Tcl being
+# "Enterprise ready."  Now we're stuck with it.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ParseStarDate { year fractYear fractDay } {
+variable Roddenberry
+# Build a tentative date from year and fraction.
+set date [dict create \
+		  gregorian 1 \
+		  era CE \
+		  year [expr { $year + $Roddenberry }] \
+		  dayOfYear [expr { $fractYear * 365 / 1000 + 1 }]]
+set date [GetJulianDayFromGregorianEraYearDay $date[set date {}]]
+# Determine whether the given year is a leap year
+set lp [IsGregorianLeapYear $date]
+# Reconvert the fractional year according to whether the given year is a
+# leap year
+if { $lp } {
+	dict set date dayOfYear \
+	    [expr { $fractYear * 366 / 1000 + 1 }]
+} else {
+	dict set date dayOfYear \
+	    [expr { $fractYear * 365 / 1000 + 1 }]
+}
+dict unset date julianDay
+dict unset date gregorian
+set date [GetJulianDayFromGregorianEraYearDay $date[set date {}]]
+return [expr {
+	86400 * [dict get $date julianDay]
+	- 210866803200
+	+ ( 86400 / 10 ) * $fractDay
+}]
+}
+#----------------------------------------------------------------------
+#
+# ScanWide --
+#
+#	Scans a wide integer from an input
+#
+# Parameters:
+#	str - String containing a decimal wide integer
+#
+# Results:
+#	Returns the string as a pure wide integer.  Throws an error if the
+#	string is misformatted or out of range.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ScanWide { str } {
+set count [::scan $str {%ld %c} result junk]
+if { $count != 1 } {
+	return -code error -errorcode [list CLOCK notAnInteger $str] \
+	    "\"$str\" is not an integer"
+}
+if { [incr result 0] != $str } {
+	return -code error -errorcode [list CLOCK integervalueTooLarge] \
+	    "integer value too large to represent"
+}
+return $result
+}
+#----------------------------------------------------------------------
+#
+# InterpretTwoDigitYear --
+#
+#	Given a date that contains only the year of the century, determines
+#	the target value of a two-digit year.
+#
+# Parameters:
+#	date - Dictionary containing fields of the date.
+#	baseTime - Base time relative to which the date is expressed.
+#	twoDigitField - Name of the field that stores the two-digit year.
+#			Default is 'yearOfCentury'
+#	fourDigitField - Name of the field that will receive the four-digit
+#	                 year.  Default is 'year'
+#
+# Results:
+#	Returns the dictionary augmented with the four-digit year, stored in
+#	the given key.
+#
+# Side effects:
+#	None.
+#
+# The current rule for interpreting a two-digit year is that the year shall be
+# between 1937 and 2037, thus staying within the range of a 32-bit signed
+# value for time.  This rule may change to a sliding window in future
+# versions, so the 'baseTime' parameter (which is currently ignored) is
+# provided in the procedure signature.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::InterpretTwoDigitYear { date baseTime
+					   { twoDigitField yearOfCentury }
+					   { fourDigitField year } } {
+set yr [dict get $date $twoDigitField]
+if { $yr <= 37 } {
+	dict set date $fourDigitField [expr { $yr + 2000 }]
+} else {
+	dict set date $fourDigitField [expr { $yr + 1900 }]
+}
+return $date
+}
+#----------------------------------------------------------------------
+#
+# AssignBaseYear --
+#
+#	Places the number of the current year into a dictionary.
+#
+# Parameters:
+#	date - Dictionary value to update
+#	baseTime - Base time from which to extract the year, expressed
+#		   in seconds from the Posix epoch
+#	timezone - the time zone in which the date is being scanned
+#	changeover - the Julian Day on which the Gregorian calendar
+#		     was adopted in the target locale.
+#
+# Results:
+#	Returns the dictionary with the current year assigned.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::AssignBaseYear { date baseTime timezone changeover } {
+variable TZData
+# Find the Julian Day Number corresponding to the base time, and
+# find the Gregorian year corresponding to that Julian Day.
+set date2 [GetDateFields $baseTime $TZData($timezone) $changeover]
+# Store the converted year
+dict set date era [dict get $date2 era]
+dict set date year [dict get $date2 year]
+return $date
+}
+#----------------------------------------------------------------------
+#
+# AssignBaseIso8601Year --
+#
+#	Determines the base year in the ISO8601 fiscal calendar.
+#
+# Parameters:
+#	date - Dictionary containing the fields of the date that
+#	       is to be augmented with the base year.
+#	baseTime - Base time expressed in seconds from the Posix epoch.
+#	timeZone - Target time zone
+#	changeover - Julian Day of adoption of the Gregorian calendar in
+#		     the target locale.
+#
+# Results:
+#	Returns the given date with "iso8601Year" set to the
+#	base year.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::AssignBaseIso8601Year {date baseTime timeZone changeover} {
+variable TZData
+# Find the Julian Day Number corresponding to the base time
+set date2 [GetDateFields $baseTime $TZData($timeZone) $changeover]
+# Calculate the ISO8601 date and transfer the year
+dict set date era CE
+dict set date iso8601Year [dict get $date2 iso8601Year]
+return $date
+}
+#----------------------------------------------------------------------
+#
+# AssignBaseMonth --
+#
+#	Places the number of the current year and month into a
+#	dictionary.
+#
+# Parameters:
+#	date - Dictionary value to update
+#	baseTime - Time from which the year and month are to be
+#	           obtained, expressed in seconds from the Posix epoch.
+#	timezone - Name of the desired time zone
+#	changeover - Julian Day on which the Gregorian calendar was adopted.
+#
+# Results:
+#	Returns the dictionary with the base year and month assigned.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::AssignBaseMonth {date baseTime timezone changeover} {
+variable TZData
+# Find the year and month corresponding to the base time
+set date2 [GetDateFields $baseTime $TZData($timezone) $changeover]
+dict set date era [dict get $date2 era]
+dict set date year [dict get $date2 year]
+dict set date month [dict get $date2 month]
+return $date
+}
+#----------------------------------------------------------------------
+#
+# AssignBaseWeek --
+#
+#	Determines the base year and week in the ISO8601 fiscal calendar.
+#
+# Parameters:
+#	date - Dictionary containing the fields of the date that
+#	       is to be augmented with the base year and week.
+#	baseTime - Base time expressed in seconds from the Posix epoch.
+#	changeover - Julian Day on which the Gregorian calendar was adopted
+#		     in the target locale.
+#
+# Results:
+#	Returns the given date with "iso8601Year" set to the
+#	base year and "iso8601Week" to the week number.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::AssignBaseWeek {date baseTime timeZone changeover} {
+variable TZData
+# Find the Julian Day Number corresponding to the base time
+set date2 [GetDateFields $baseTime $TZData($timeZone) $changeover]
+# Calculate the ISO8601 date and transfer the year
+dict set date era CE
+dict set date iso8601Year [dict get $date2 iso8601Year]
+dict set date iso8601Week [dict get $date2 iso8601Week]
+return $date
+}
+#----------------------------------------------------------------------
+#
+# AssignBaseJulianDay --
+#
+#	Determines the base day for a time-of-day conversion.
+#
+# Parameters:
+#	date - Dictionary that is to get the base day
+#	baseTime - Base time expressed in seconds from the Posix epoch
+#	changeover - Julian day on which the Gregorian calendar was
+#		     adpoted in the target locale.
+#
+# Results:
+#	Returns the given dictionary augmented with a 'julianDay' field
+#	that contains the base day.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::AssignBaseJulianDay { date baseTime timeZone changeover } {
+variable TZData
+# Find the Julian Day Number corresponding to the base time
+set date2 [GetDateFields $baseTime $TZData($timeZone) $changeover]
+dict set date julianDay [dict get $date2 julianDay]
+return $date
+}
+#----------------------------------------------------------------------
+#
+# InterpretHMSP --
+#
+#	Interprets a time in the form "hh:mm:ss am".
+#
+# Parameters:
+#	date -- Dictionary containing "hourAMPM", "minute", "second"
+#	        and "amPmIndicator" fields.
+#
+# Results:
+#	Returns the number of seconds from local midnight.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::InterpretHMSP { date } {
+set hr [dict get $date hourAMPM]
+if { $hr == 12 } {
+	set hr 0
+}
+if { [dict get $date amPmIndicator] } {
+	incr hr 12
+}
+dict set date hour $hr
+return [InterpretHMS $date[set date {}]]
+}
+#----------------------------------------------------------------------
+#
+# InterpretHMS --
+#
+#	Interprets a 24-hour time "hh:mm:ss"
+#
+# Parameters:
+#	date -- Dictionary containing the "hour", "minute" and "second"
+#	        fields.
+#
+# Results:
+#	Returns the given dictionary augmented with a "secondOfDay"
+#	field containing the number of seconds from local midnight.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::InterpretHMS { date } {
+return [expr {
+	( [dict get $date hour] * 60
+	  + [dict get $date minute] ) * 60
+	+ [dict get $date second]
+}]
+}
+#----------------------------------------------------------------------
+#
+# GetSystemTimeZone --
+#
+#	Determines the system time zone, which is the default for the
+#	'clock' command if no other zone is supplied.
+#
+# Parameters:
+#	None.
+#
+# Results:
+#	Returns the system time zone.
+#
+# Side effects:
+#	Stores the sustem time zone in the 'CachedSystemTimeZone'
+#	variable, since determining it may be an expensive process.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::GetSystemTimeZone {} {
+variable CachedSystemTimeZone
+variable TimeZoneBad
+if {[set result [getenv TCL_TZ]] ne {}} {
+	set timezone $result
+} elseif {[set result [getenv TZ]] ne {}} {
+	set timezone $result
+} else {
+# Cache the time zone only if it was detected by one of the
+# expensive methods.
+if { [info exists CachedSystemTimeZone] } {
+set timezone $CachedSystemTimeZone
+} elseif { $::tcl_platform(platform) eq {windows} } {
+set timezone [GuessWindowsTimeZone]
+} elseif { [file exists /etc/localtime]
+&& ![catch {ReadZoneinfoFile \
+Tcl/Localtime /etc/localtime}] } {
+set timezone :Tcl/Localtime
+} else {
+set timezone :localtime
+}
+	set CachedSystemTimeZone $timezone
+}
+if { ![dict exists $TimeZoneBad $timezone] } {
+	dict set TimeZoneBad $timezone [catch {SetupTimeZone $timezone}]
+}
+if { [dict get $TimeZoneBad $timezone] } {
+	return :localtime
+} else {
+	return $timezone
+}
+}
+#----------------------------------------------------------------------
+#
+# ConvertLegacyTimeZone --
+#
+#	Given an alphanumeric time zone identifier and the system time zone,
+#	convert the alphanumeric identifier to an unambiguous time zone.
+#
+# Parameters:
+#	tzname - Name of the time zone to convert
+#
+# Results:
+#	Returns a time zone name corresponding to tzname, but in an
+#	unambiguous form, generally +hhmm.
+#
+# This procedure is implemented primarily to allow the parsing of RFC822
+# date/time strings.  Processing a time zone name on input is not recommended
+# practice, because there is considerable room for ambiguity; for instance, is
+# BST Brazilian Standard Time, or British Summer Time?
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ConvertLegacyTimeZone { tzname } {
+variable LegacyTimeZone
+set tzname [string tolower $tzname]
+if { ![dict exists $LegacyTimeZone $tzname] } {
+	return -code error -errorcode [list CLOCK badTZName $tzname] \
+	    "time zone \"$tzname\" not found"
+}
+return [dict get $LegacyTimeZone $tzname]
+}
+#----------------------------------------------------------------------
+#
+# SetupTimeZone --
+#
+#	Given the name or specification of a time zone, sets up its in-memory
+#	data.
+#
+# Parameters:
+#	tzname - Name of a time zone
+#
+# Results:
+#	Unless the time zone is ':localtime', sets the TZData array to contain
+#	the lookup table for local<->UTC conversion.  Returns an error if the
+#	time zone cannot be parsed.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::SetupTimeZone { timezone } {
+variable TZData
+if {! [info exists TZData($timezone)] } {
+	variable MINWIDE
+	if { $timezone eq {:localtime} } {
+	    # Nothing to do, we'll convert using the localtime function
+	} elseif {
+	    [regexp {^([-+])(\d\d)(?::?(\d\d)(?::?(\d\d))?)?} $timezone \
+		    -> s hh mm ss]
+	} then {
+	    # Make a fixed offset
+	    ::scan $hh %d hh
+	    if { $mm eq {} } {
+		set mm 0
+	    } else {
+		::scan $mm %d mm
+	    }
+	    if { $ss eq {} } {
+		set ss 0
+	    } else {
+		::scan $ss %d ss
+	    }
+	    set offset [expr { ( $hh * 60 + $mm ) * 60 + $ss }]
+	    if { $s eq {-} } {
+		set offset [expr { - $offset }]
+	    }
+	    set TZData($timezone) [list [list $MINWIDE $offset -1 $timezone]]
+	} elseif { [string index $timezone 0] eq {:} } {
+	    # Convert using a time zone file
+	    if {
+		[catch {
+		    LoadTimeZoneFile [string range $timezone 1 end]
+		}] && [catch {
+		    LoadZoneinfoFile [string range $timezone 1 end]
+		}]
+	    } then {
+		return -code error \
+		    -errorcode [list CLOCK badTimeZone $timezone] \
+		    "time zone \"$timezone\" not found"
+	    }
+	} elseif { ![catch {ParsePosixTimeZone $timezone} tzfields] } {
+	    # This looks like a POSIX time zone - try to process it
+	    if { [catch {ProcessPosixTimeZone $tzfields} data opts] } {
+		if { [lindex [dict get $opts -errorcode] 0] eq {CLOCK} } {
+		    dict unset opts -errorinfo
+		}
+		return -options $opts $data
+	    } else {
+		set TZData($timezone) $data
+	    }
+	} else {
+	    # We couldn't parse this as a POSIX time zone.  Try again with a
+	    # time zone file - this time without a colon
+	    if { [catch { LoadTimeZoneFile $timezone }]
+		 && [catch { LoadZoneinfoFile $timezone } - opts] } {
+		dict unset opts -errorinfo
+		return -options $opts "time zone $timezone not found"
+	    }
+	    set TZData($timezone) $TZData(:$timezone)
+	}
+}
+return
+}
+#----------------------------------------------------------------------
+#
+# GuessWindowsTimeZone --
+#
+#	Determines the system time zone on windows.
+#
+# Parameters:
+#	None.
+#
+# Results:
+#	Returns a time zone specifier that corresponds to the system time zone
+#	information found in the Registry.
+#
+# Bugs:
+#	Fixed dates for DST change are unimplemented at present, because no
+#	time zone information supplied with Windows actually uses them!
+#
+# On a Windows system where neither $env(TCL_TZ) nor $env(TZ) is specified,
+# GuessWindowsTimeZone looks in the Registry for the system time zone
+# information.  It then attempts to find an entry in WinZoneInfo for a time
+# zone that uses the same rules.  If it finds one, it returns it; otherwise,
+# it constructs a Posix-style time zone string and returns that.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::GuessWindowsTimeZone {} {
+variable WinZoneInfo
+variable NoRegistry
+variable TimeZoneBad
+if { [info exists NoRegistry] } {
+	return :localtime
+}
+# Dredge time zone information out of the registry
+if { [catch {
+	set rpath HKEY_LOCAL_MACHINE\\System\\CurrentControlSet\\Control\\TimeZoneInformation
+	set data [list \
+		      [expr { -60
+			      * [registry get $rpath Bias] }] \
+		      [expr { -60
+				  * [registry get $rpath StandardBias] }] \
+		      [expr { -60 \
+				  * [registry get $rpath DaylightBias] }]]
+	set stdtzi [registry get $rpath StandardStart]
+	foreach ind {0 2 14 4 6 8 10 12} {
+	    binary scan $stdtzi @${ind}s val
+	    lappend data $val
+	}
+	set daytzi [registry get $rpath DaylightStart]
+	foreach ind {0 2 14 4 6 8 10 12} {
+	    binary scan $daytzi @${ind}s val
+	    lappend data $val
+	}
+}] } {
+	# Missing values in the Registry - bail out
+	return :localtime
+}
+# Make up a Posix time zone specifier if we can't find one.  Check here
+# that the tzdata file exists, in case we're running in an environment
+# (e.g. starpack) where tzdata is incomplete.  (Bug 1237907)
+if { [dict exists $WinZoneInfo $data] } {
+	set tzname [dict get $WinZoneInfo $data]
+	if { ! [dict exists $TimeZoneBad $tzname] } {
+	    dict set TimeZoneBad $tzname [catch {SetupTimeZone $tzname}]
+	}
+} else {
+	set tzname {}
+}
+if { $tzname eq {} || [dict get $TimeZoneBad $tzname] } {
+	lassign $data \
+	    bias stdBias dstBias \
+	    stdYear stdMonth stdDayOfWeek stdDayOfMonth \
+	    stdHour stdMinute stdSecond stdMillisec \
+	    dstYear dstMonth dstDayOfWeek dstDayOfMonth \
+	    dstHour dstMinute dstSecond dstMillisec
+	set stdDelta [expr { $bias + $stdBias }]
+	set dstDelta [expr { $bias + $dstBias }]
+	if { $stdDelta <= 0 } {
+	    set stdSignum +
+	    set stdDelta [expr { - $stdDelta }]
+	    set dispStdSignum -
+	} else {
+	    set stdSignum -
+	    set dispStdSignum +
+	}
+	set hh [::format %02d [expr { $stdDelta / 3600 }]]
+	set mm [::format %02d [expr { ($stdDelta / 60 ) % 60 }]]
+	set ss [::format %02d [expr { $stdDelta % 60 }]]
+	set tzname {}
+	append tzname < $dispStdSignum $hh $mm > $stdSignum $hh : $mm : $ss
+	if { $stdMonth >= 0 } {
+	    if { $dstDelta <= 0 } {
+		set dstSignum +
+		set dstDelta [expr { - $dstDelta }]
+		set dispDstSignum -
+	    } else {
+		set dstSignum -
+		set dispDstSignum +
+	    }
+	    set hh [::format %02d [expr { $dstDelta / 3600 }]]
+	    set mm [::format %02d [expr { ($dstDelta / 60 ) % 60 }]]
+	    set ss [::format %02d [expr { $dstDelta % 60 }]]
+	    append tzname < $dispDstSignum $hh $mm > $dstSignum $hh : $mm : $ss
+	    if { $dstYear == 0 } {
+		append tzname ,M $dstMonth . $dstDayOfMonth . $dstDayOfWeek
+	    } else {
+		# I have not been able to find any locale on which Windows
+		# converts time zone on a fixed day of the year, hence don't
+		# know how to interpret the fields.  If someone can inform me,
+		# I'd be glad to code it up.  For right now, we bail out in
+		# such a case.
+		return :localtime
+	    }
+	    append tzname / [::format %02d $dstHour] \
+		: [::format %02d $dstMinute] \
+		: [::format %02d $dstSecond]
+	    if { $stdYear == 0 } {
+		append tzname ,M $stdMonth . $stdDayOfMonth . $stdDayOfWeek
+	    } else {
+		# I have not been able to find any locale on which Windows
+		# converts time zone on a fixed day of the year, hence don't
+		# know how to interpret the fields.  If someone can inform me,
+		# I'd be glad to code it up.  For right now, we bail out in
+		# such a case.
+		return :localtime
+	    }
+	    append tzname / [::format %02d $stdHour] \
+		: [::format %02d $stdMinute] \
+		: [::format %02d $stdSecond]
+	}
+	dict set WinZoneInfo $data $tzname
+}
+return [dict get $WinZoneInfo $data]
+}
+#----------------------------------------------------------------------
+#
+# LoadTimeZoneFile --
+#
+#	Load the data file that specifies the conversion between a
+#	given time zone and Greenwich.
+#
+# Parameters:
+#	fileName -- Name of the file to load
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	TZData(:fileName) contains the time zone data
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::LoadTimeZoneFile { fileName } {
+variable DataDir
+variable TZData
+if { [info exists TZData($fileName)] } {
+	return
+}
+# Since an unsafe interp uses the [clock] command in the parent, this code
+# is security sensitive.  Make sure that the path name cannot escape the
+# given directory.
+if { ![regexp {^[[.-.][:alpha:]_]+(?:/[[.-.][:alpha:]_]+)*$} $fileName] } {
+	return -code error \
+	    -errorcode [list CLOCK badTimeZone $:fileName] \
+	    "time zone \":$fileName\" not valid"
+}
+try {
+	source -encoding utf-8 [file join $DataDir $fileName]
+} on error {} {
+	return -code error \
+	    -errorcode [list CLOCK badTimeZone :$fileName] \
+	    "time zone \":$fileName\" not found"
+}
+return
+}
+#----------------------------------------------------------------------
+#
+# LoadZoneinfoFile --
+#
+#	Loads a binary time zone information file in Olson format.
+#
+# Parameters:
+#	fileName - Relative path name of the file to load.
+#
+# Results:
+#	Returns an empty result normally; returns an error if no Olson file
+#	was found or the file was malformed in some way.
+#
+# Side effects:
+#	TZData(:fileName) contains the time zone data
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::LoadZoneinfoFile { fileName } {
+variable ZoneinfoPaths
+# Since an unsafe interp uses the [clock] command in the parent, this code
+# is security sensitive.  Make sure that the path name cannot escape the
+# given directory.
+if { ![regexp {^[[.-.][:alpha:]_]+(?:/[[.-.][:alpha:]_]+)*$} $fileName] } {
+	return -code error \
+	    -errorcode [list CLOCK badTimeZone $:fileName] \
+	    "time zone \":$fileName\" not valid"
+}
+foreach d $ZoneinfoPaths {
+	set fname [file join $d $fileName]
+	if { [file readable $fname] && [file isfile $fname] } {
+	    break
+	}
+	unset fname
+}
+ReadZoneinfoFile $fileName $fname
+}
+#----------------------------------------------------------------------
+#
+# ReadZoneinfoFile --
+#
+#	Loads a binary time zone information file in Olson format.
+#
+# Parameters:
+#	fileName - Name of the time zone (relative path name of the
+#		   file).
+#	fname - Absolute path name of the file.
+#
+# Results:
+#	Returns an empty result normally; returns an error if no Olson file
+#	was found or the file was malformed in some way.
+#
+# Side effects:
+#	TZData(:fileName) contains the time zone data
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ReadZoneinfoFile {fileName fname} {
+variable MINWIDE
+variable TZData
+if { ![file exists $fname] } {
+	return -code error "$fileName not found"
+}
+if { [file size $fname] > 262144 } {
+	return -code error "$fileName too big"
+}
+# Suck in all the data from the file
+set f [open $fname r]
+fconfigure $f -translation binary
+set d [read $f]
+close $f
+# The file begins with a magic number, sixteen reserved bytes, and then
+# six 4-byte integers giving counts of fileds in the file.
+binary scan $d a4a1x15IIIIII \
+	magic version nIsGMT nIsStd nLeap nTime nType nChar
+set seek 44
+set ilen 4
+set iformat I
+if { $magic != {TZif} } {
+	return -code error "$fileName not a time zone information file"
+}
+if { $nType > 255 } {
+	return -code error "$fileName contains too many time types"
+}
+# Accept only Posix-style zoneinfo.  Sorry, 'leaps' bigots.
+if { $nLeap != 0 } {
+	return -code error "$fileName contains leap seconds"
+}
+# In a version 2 file, we use the second part of the file, which contains
+# 64-bit transition times.
+if {$version eq "2"} {
+	set seek [expr {
+	    44
+	    + 5 * $nTime
+	    + 6 * $nType
+	    + 4 * $nLeap
+	    + $nIsStd
+	    + $nIsGMT
+	    + $nChar
+	}]
+	binary scan $d @${seek}a4a1x15IIIIII \
+	    magic version nIsGMT nIsStd nLeap nTime nType nChar
+	if {$magic ne {TZif}} {
+	    return -code error "seek address $seek miscomputed, magic = $magic"
+	}
+	set iformat W
+	set ilen 8
+	incr seek 44
+}
+# Next come ${nTime} transition times, followed by ${nTime} time type
+# codes.  The type codes are unsigned 1-byte quantities.  We insert an
+# arbitrary start time in front of the transitions.
+binary scan $d @${seek}${iformat}${nTime}c${nTime} times tempCodes
+incr seek [expr { ($ilen + 1) * $nTime }]
+set times [linsert $times 0 $MINWIDE]
+set codes {}
+foreach c $tempCodes {
+	lappend codes [expr { $c & 0xFF }]
+}
+set codes [linsert $codes 0 0]
+# Next come ${nType} time type descriptions, each of which has an offset
+# (seconds east of GMT), a DST indicator, and an index into the
+# abbreviation text.
+for { set i 0 } { $i < $nType } { incr i } {
+	binary scan $d @${seek}Icc gmtOff isDst abbrInd
+	lappend types [list $gmtOff $isDst $abbrInd]
+	incr seek 6
+}
+# Next come $nChar characters of time zone name abbreviations, which are
+# null-terminated.
+# We build them up into a dictionary indexed by character index, because
+# that's what's in the indices above.
+binary scan $d @${seek}a${nChar} abbrs
+incr seek ${nChar}
+set abbrList [split $abbrs \0]
+set i 0
+set abbrevs {}
+foreach a $abbrList {
+	for {set j 0} {$j <= [string length $a]} {incr j} {
+	    dict set abbrevs $i [string range $a $j end]
+	    incr i
+	}
+}
+# Package up a list of tuples, each of which contains transition time,
+# seconds east of Greenwich, DST flag and time zone abbreviation.
+set r {}
+set lastTime $MINWIDE
+foreach t $times c $codes {
+	if { $t < $lastTime } {
+	    return -code error "$fileName has times out of order"
+	}
+	set lastTime $t
+	lassign [lindex $types $c] gmtoff isDst abbrInd
+	set abbrev [dict get $abbrevs $abbrInd]
+	lappend r [list $t $gmtoff $isDst $abbrev]
+}
+# In a version 2 file, there is also a POSIX-style time zone description
+# at the very end of the file.  To get to it, skip over nLeap leap second
+# values (8 bytes each),
+# nIsStd standard/DST indicators and nIsGMT UTC/local indicators.
+if {$version eq {2}} {
+	set seek [expr {$seek + 8 * $nLeap + $nIsStd + $nIsGMT + 1}]
+	set last [string first \n $d $seek]
+	set posix [string range $d $seek [expr {$last-1}]]
+	if {[llength $posix] > 0} {
+	    set posixFields [ParsePosixTimeZone $posix]
+	    foreach tuple [ProcessPosixTimeZone $posixFields] {
+		lassign $tuple t gmtoff isDst abbrev
+		if {$t > $lastTime} {
+		    lappend r $tuple
+		}
+	    }
+	}
+}
+set TZData(:$fileName) $r
+return
+}
+#----------------------------------------------------------------------
+#
+# ParsePosixTimeZone --
+#
+#	Parses the TZ environment variable in Posix form
+#
+# Parameters:
+#	tz	Time zone specifier to be interpreted
+#
+# Results:
+#	Returns a dictionary whose values contain the various pieces of the
+#	time zone specification.
+#
+# Side effects:
+#	None.
+#
+# Errors:
+#	Throws an error if the syntax of the time zone is incorrect.
+#
+# The following keys are present in the dictionary:
+#	stdName - Name of the time zone when Daylight Saving Time
+#		  is not in effect.
+#	stdSignum - Sign (+, -, or empty) of the offset from Greenwich
+#		    to the given (non-DST) time zone.  + and the empty
+#		    string denote zones west of Greenwich, - denotes east
+#		    of Greenwich; this is contrary to the ISO convention
+#		    but follows Posix.
+#	stdHours - Hours part of the offset from Greenwich to the given
+#		   (non-DST) time zone.
+#	stdMinutes - Minutes part of the offset from Greenwich to the
+#		     given (non-DST) time zone. Empty denotes zero.
+#	stdSeconds - Seconds part of the offset from Greenwich to the
+#		     given (non-DST) time zone. Empty denotes zero.
+#	dstName - Name of the time zone when DST is in effect, or the
+#		  empty string if the time zone does not observe Daylight
+#		  Saving Time.
+#	dstSignum, dstHours, dstMinutes, dstSeconds -
+#		Fields corresponding to stdSignum, stdHours, stdMinutes,
+#		stdSeconds for the Daylight Saving Time version of the
+#		time zone.  If dstHours is empty, it is presumed to be 1.
+#	startDayOfYear - The ordinal number of the day of the year on which
+#			 Daylight Saving Time begins.  If this field is
+#			 empty, then DST begins on a given month-week-day,
+#			 as below.
+#	startJ - The letter J, or an empty string.  If a J is present in
+#		 this field, then startDayOfYear does not count February 29
+#		 even in leap years.
+#	startMonth - The number of the month in which Daylight Saving Time
+#		     begins, supplied if startDayOfYear is empty.  If both
+#		     startDayOfYear and startMonth are empty, then US rules
+#		     are presumed.
+#	startWeekOfMonth - The number of the week in the month in which
+#			   Daylight Saving Time begins, in the range 1-5.
+#			   5 denotes the last week of the month even in a
+#			   4-week month.
+#	startDayOfWeek - The number of the day of the week (Sunday=0,
+#			 Saturday=6) on which Daylight Saving Time begins.
+#	startHours - The hours part of the time of day at which Daylight
+#		     Saving Time begins. An empty string is presumed to be 2.
+#	startMinutes - The minutes part of the time of day at which DST begins.
+#		       An empty string is presumed zero.
+#	startSeconds - The seconds part of the time of day at which DST begins.
+#		       An empty string is presumed zero.
+#	endDayOfYear, endJ, endMonth, endWeekOfMonth, endDayOfWeek,
+#	endHours, endMinutes, endSeconds -
+#		Specify the end of DST in the same way that the start* fields
+#		specify the beginning of DST.
+#
+# This procedure serves only to break the time specifier into fields.  No
+# attempt is made to canonicalize the fields or supply default values.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ParsePosixTimeZone { tz } {
+if {[regexp -expanded -nocase -- {
+	^
+	# 1 - Standard time zone name
+	([[:alpha:]]+ | <[-+[:alnum:]]+>)
+	# 2 - Standard time zone offset, signum
+	([-+]?)
+	# 3 - Standard time zone offset, hours
+	([[:digit:]]{1,2})
+	(?:
+	    # 4 - Standard time zone offset, minutes
+	    : ([[:digit:]]{1,2})
+	    (?:
+	        # 5 - Standard time zone offset, seconds
+		: ([[:digit:]]{1,2} )
+	    )?
+	)?
+	(?:
+	    # 6 - DST time zone name
+	    ([[:alpha:]]+ | <[-+[:alnum:]]+>)
+	    (?:
+	        (?:
+		    # 7 - DST time zone offset, signum
+		    ([-+]?)
+		    # 8 - DST time zone offset, hours
+		    ([[:digit:]]{1,2})
+		    (?:
+			# 9 - DST time zone offset, minutes
+			: ([[:digit:]]{1,2})
+			(?:
+		            # 10 - DST time zone offset, seconds
+			    : ([[:digit:]]{1,2})
+			)?
+		    )?
+		)?
+	        (?:
+		    ,
+		    (?:
+			# 11 - Optional J in n and Jn form 12 - Day of year
+		        ( J ? )	( [[:digit:]]+ )
+| M
+			# 13 - Month number 14 - Week of month 15 - Day of week
+			( [[:digit:]] + )
+			[.] ( [[:digit:]] + )
+			[.] ( [[:digit:]] + )
+		    )
+		    (?:
+			# 16 - Start time of DST - hours
+			/ ( [[:digit:]]{1,2} )
+		        (?:
+			    # 17 - Start time of DST - minutes
+			    : ( [[:digit:]]{1,2} )
+			    (?:
+				# 18 - Start time of DST - seconds
+				: ( [[:digit:]]{1,2} )
+			    )?
+			)?
+		    )?
+		    ,
+		    (?:
+			# 19 - Optional J in n and Jn form 20 - Day of year
+		        ( J ? )	( [[:digit:]]+ )
+| M
+			# 21 - Month number 22 - Week of month 23 - Day of week
+			( [[:digit:]] + )
+			[.] ( [[:digit:]] + )
+			[.] ( [[:digit:]] + )
+		    )
+		    (?:
+			# 24 - End time of DST - hours
+			/ ( [[:digit:]]{1,2} )
+		        (?:
+			    # 25 - End time of DST - minutes
+			    : ( [[:digit:]]{1,2} )
+			    (?:
+				# 26 - End time of DST - seconds
+				: ( [[:digit:]]{1,2} )
+			    )?
+			)?
+		    )?
+)?
+	    )?
+)?
+	$
+} $tz -> x(stdName) x(stdSignum) x(stdHours) x(stdMinutes) x(stdSeconds) \
+	     x(dstName) x(dstSignum) x(dstHours) x(dstMinutes) x(dstSeconds) \
+	     x(startJ) x(startDayOfYear) \
+	     x(startMonth) x(startWeekOfMonth) x(startDayOfWeek) \
+	     x(startHours) x(startMinutes) x(startSeconds) \
+	     x(endJ) x(endDayOfYear) \
+	     x(endMonth) x(endWeekOfMonth) x(endDayOfWeek) \
+	     x(endHours) x(endMinutes) x(endSeconds)] } {
+	# it's a good timezone
+	return [array get x]
+}
+return -code error\
+	-errorcode [list CLOCK badTimeZone $tz] \
+	"unable to parse time zone specification \"$tz\""
+}
+#----------------------------------------------------------------------
+#
+# ProcessPosixTimeZone --
+#
+#	Handle a Posix time zone after it's been broken out into fields.
+#
+# Parameters:
+#	z - Dictionary returned from 'ParsePosixTimeZone'
+#
+# Results:
+#	Returns time zone information for the 'TZData' array.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ProcessPosixTimeZone { z } {
+variable MINWIDE
+variable TZData
+# Determine the standard time zone name and seconds east of Greenwich
+set stdName [dict get $z stdName]
+if { [string index $stdName 0] eq {<} } {
+	set stdName [string range $stdName 1 end-1]
+}
+if { [dict get $z stdSignum] eq {-} } {
+	set stdSignum +1
+} else {
+	set stdSignum -1
+}
+set stdHours [lindex [::scan [dict get $z stdHours] %d] 0]
+if { [dict get $z stdMinutes] ne {} } {
+	set stdMinutes [lindex [::scan [dict get $z stdMinutes] %d] 0]
+} else {
+	set stdMinutes 0
+}
+if { [dict get $z stdSeconds] ne {} } {
+	set stdSeconds [lindex [::scan [dict get $z stdSeconds] %d] 0]
+} else {
+	set stdSeconds 0
+}
+set stdOffset [expr {
+	(($stdHours * 60 + $stdMinutes) * 60 + $stdSeconds) * $stdSignum
+}]
+set data [list [list $MINWIDE $stdOffset 0 $stdName]]
+# If there's no daylight zone, we're done
+set dstName [dict get $z dstName]
+if { $dstName eq {} } {
+	return $data
+}
+if { [string index $dstName 0] eq {<} } {
+	set dstName [string range $dstName 1 end-1]
+}
+# Determine the daylight name
+if { [dict get $z dstSignum] eq {-} } {
+	set dstSignum +1
+} else {
+	set dstSignum -1
+}
+if { [dict get $z dstHours] eq {} } {
+	set dstOffset [expr { 3600 + $stdOffset }]
+} else {
+	set dstHours [lindex [::scan [dict get $z dstHours] %d] 0]
+	if { [dict get $z dstMinutes] ne {} } {
+	    set dstMinutes [lindex [::scan [dict get $z dstMinutes] %d] 0]
+	} else {
+	    set dstMinutes 0
+	}
+	if { [dict get $z dstSeconds] ne {} } {
+	    set dstSeconds [lindex [::scan [dict get $z dstSeconds] %d] 0]
+	} else {
+	    set dstSeconds 0
+	}
+	set dstOffset [expr {
+	    (($dstHours*60 + $dstMinutes) * 60 + $dstSeconds) * $dstSignum
+	}]
+}
+# Fill in defaults for European or US DST rules
+# US start time is the second Sunday in March
+# EU start time is the last Sunday in March
+# US end time is the first Sunday in November.
+# EU end time is the last Sunday in October
+if {
+	[dict get $z startDayOfYear] eq {}
+	&& [dict get $z startMonth] eq {}
+} then {
+	if {($stdSignum * $stdHours>=0) && ($stdSignum * $stdHours<=12)} {
+	    # EU
+	    dict set z startWeekOfMonth 5
+	    if {$stdHours>2} {
+		dict set z startHours 2
+	    } else {
+		dict set z startHours [expr {$stdHours+1}]
+	    }
+	} else {
+	    # US
+	    dict set z startWeekOfMonth 2
+	    dict set z startHours 2
+	}
+	dict set z startMonth 3
+	dict set z startDayOfWeek 0
+	dict set z startMinutes 0
+	dict set z startSeconds 0
+}
+if {
+	[dict get $z endDayOfYear] eq {}
+	&& [dict get $z endMonth] eq {}
+} then {
+	if {($stdSignum * $stdHours>=0) && ($stdSignum * $stdHours<=12)} {
+	    # EU
+	    dict set z endMonth 10
+	    dict set z endWeekOfMonth 5
+	    if {$stdHours>2} {
+		dict set z endHours 3
+	    } else {
+		dict set z endHours [expr {$stdHours+2}]
+	    }
+	} else {
+	    # US
+	    dict set z endMonth 11
+	    dict set z endWeekOfMonth 1
+	    dict set z endHours 2
+	}
+	dict set z endDayOfWeek 0
+	dict set z endMinutes 0
+	dict set z endSeconds 0
+}
+# Put DST in effect in all years from 1916 to 2099.
+for { set y 1916 } { $y < 2100 } { incr y } {
+	set startTime [DeterminePosixDSTTime $z start $y]
+	incr startTime [expr { - wide($stdOffset) }]
+	set endTime [DeterminePosixDSTTime $z end $y]
+	incr endTime [expr { - wide($dstOffset) }]
+	if { $startTime < $endTime } {
+	    lappend data \
+		[list $startTime $dstOffset 1 $dstName] \
+		[list $endTime $stdOffset 0 $stdName]
+	} else {
+	    lappend data \
+		[list $endTime $stdOffset 0 $stdName] \
+		[list $startTime $dstOffset 1 $dstName]
+	}
+}
+return $data
+}
+#----------------------------------------------------------------------
+#
+# DeterminePosixDSTTime --
+#
+#	Determines the time that Daylight Saving Time starts or ends from a
+#	Posix time zone specification.
+#
+# Parameters:
+#	z - Time zone data returned from ParsePosixTimeZone.
+#	    Missing fields are expected to be filled in with
+#	    default values.
+#	bound - The word 'start' or 'end'
+#	y - The year for which the transition time is to be determined.
+#
+# Results:
+#	Returns the transition time as a count of seconds from the epoch.  The
+#	time is relative to the wall clock, not UTC.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::DeterminePosixDSTTime { z bound y } {
+variable FEB_28
+# Determine the start or end day of DST
+set date [dict create era CE year $y]
+set doy [dict get $z ${bound}DayOfYear]
+if { $doy ne {} } {
+	# Time was specified as a day of the year
+	if { [dict get $z ${bound}J] ne {}
+	     && [IsGregorianLeapYear $y]
+	     && ( $doy > $FEB_28 ) } {
+	    incr doy
+	}
+	dict set date dayOfYear $doy
+	set date [GetJulianDayFromEraYearDay $date[set date {}] 2361222]
+} else {
+	# Time was specified as a day of the week within a month
+	dict set date month [dict get $z ${bound}Month]
+	dict set date dayOfWeek [dict get $z ${bound}DayOfWeek]
+	set dowim [dict get $z ${bound}WeekOfMonth]
+	if { $dowim >= 5 } {
+	    set dowim -1
+	}
+	dict set date dayOfWeekInMonth $dowim
+	set date [GetJulianDayFromEraYearMonthWeekDay $date[set date {}] 2361222]
+}
+set jd [dict get $date julianDay]
+set seconds [expr {
+	wide($jd) * wide(86400) - wide(210866803200)
+}]
+set h [dict get $z ${bound}Hours]
+if { $h eq {} } {
+	set h 2
+} else {
+	set h [lindex [::scan $h %d] 0]
+}
+set m [dict get $z ${bound}Minutes]
+if { $m eq {} } {
+	set m 0
+} else {
+	set m [lindex [::scan $m %d] 0]
+}
+set s [dict get $z ${bound}Seconds]
+if { $s eq {} } {
+	set s 0
+} else {
+	set s [lindex [::scan $s %d] 0]
+}
+set tod [expr { ( $h * 60 + $m ) * 60 + $s }]
+return [expr { $seconds + $tod }]
+}
+#----------------------------------------------------------------------
+#
+# GetLocaleEra --
+#
+#	Given local time expressed in seconds from the Posix epoch,
+#	determine localized era and year within the era.
+#
+# Parameters:
+#	date - Dictionary that must contain the keys, 'localSeconds',
+#	       whose value is expressed as the appropriate local time;
+#	       and 'year', whose value is the Gregorian year.
+#	etable - Value of the LOCALE_ERAS key in the message catalogue
+#	         for the target locale.
+#
+# Results:
+#	Returns the dictionary, augmented with the keys, 'localeEra' and
+#	'localeYear'.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::GetLocaleEra { date etable } {
+set index [BSearch $etable [dict get $date localSeconds]]
+if { $index < 0} {
+	dict set date localeEra \
+	    [::format %02d [expr { [dict get $date year] / 100 }]]
+	dict set date localeYear [expr {
+	    [dict get $date year] % 100
+	}]
+} else {
+	dict set date localeEra [lindex $etable $index 1]
+	dict set date localeYear [expr {
+	    [dict get $date year] - [lindex $etable $index 2]
+	}]
+}
+return $date
+}
+#----------------------------------------------------------------------
+#
+# GetJulianDayFromEraYearDay --
+#
+#	Given a year, month and day on the Gregorian calendar, determines
+#	the Julian Day Number beginning at noon on that date.
+#
+# Parameters:
+#	date -- A dictionary in which the 'era', 'year', and
+#		'dayOfYear' slots are populated. The calendar in use
+#		is determined by the date itself relative to:
+#       changeover -- Julian day on which the Gregorian calendar was
+#		adopted in the current locale.
+#
+# Results:
+#	Returns the given dictionary augmented with a 'julianDay' key whose
+#	value is the desired Julian Day Number, and a 'gregorian' key that
+#	specifies whether the calendar is Gregorian (1) or Julian (0).
+#
+# Side effects:
+#	None.
+#
+# Bugs:
+#	This code needs to be moved to the C layer.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::GetJulianDayFromEraYearDay {date changeover} {
+# Get absolute year number from the civil year
+switch -exact -- [dict get $date era] {
+	BCE {
+	    set year [expr { 1 - [dict get $date year] }]
+	}
+	CE {
+	    set year [dict get $date year]
+	}
+}
+set ym1 [expr { $year - 1 }]
+# Try the Gregorian calendar first.
+dict set date gregorian 1
+set jd [expr {
+	1721425
+	+ [dict get $date dayOfYear]
+	+ ( 365 * $ym1 )
+	+ ( $ym1 / 4 )
+	- ( $ym1 / 100 )
+	+ ( $ym1 / 400 )
+}]
+# If the date is before the Gregorian change, use the Julian calendar.
+if { $jd < $changeover } {
+	dict set date gregorian 0
+	set jd [expr {
+	    1721423
+	    + [dict get $date dayOfYear]
+	    + ( 365 * $ym1 )
+	    + ( $ym1 / 4 )
+	}]
+}
+dict set date julianDay $jd
+return $date
+}
+#----------------------------------------------------------------------
+#
+# GetJulianDayFromEraYearMonthWeekDay --
+#
+#	Determines the Julian Day number corresponding to the nth given
+#	day-of-the-week in a given month.
+#
+# Parameters:
+#	date - Dictionary containing the keys, 'era', 'year', 'month'
+#	       'weekOfMonth', 'dayOfWeek', and 'dayOfWeekInMonth'.
+#	changeover - Julian Day of adoption of the Gregorian calendar
+#
+# Results:
+#	Returns the given dictionary, augmented with a 'julianDay' key.
+#
+# Side effects:
+#	None.
+#
+# Bugs:
+#	This code needs to be moved to the C layer.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::GetJulianDayFromEraYearMonthWeekDay {date changeover} {
+# Come up with a reference day; either the zeroeth day of the given month
+# (dayOfWeekInMonth >= 0) or the seventh day of the following month
+# (dayOfWeekInMonth < 0)
+set date2 $date
+set week [dict get $date dayOfWeekInMonth]
+if { $week >= 0 } {
+	dict set date2 dayOfMonth 0
+} else {
+	dict incr date2 month
+	dict set date2 dayOfMonth 7
+}
+set date2 [GetJulianDayFromEraYearMonthDay $date2[set date2 {}] \
+		   $changeover]
+set wd0 [WeekdayOnOrBefore [dict get $date dayOfWeek] \
+		 [dict get $date2 julianDay]]
+dict set date julianDay [expr { $wd0 + 7 * $week }]
+return $date
+}
+#----------------------------------------------------------------------
+#
+# IsGregorianLeapYear --
+#
+#	Determines whether a given date represents a leap year in the
+#	Gregorian calendar.
+#
+# Parameters:
+#	date -- The date to test.  The fields, 'era', 'year' and 'gregorian'
+#	        must be set.
+#
+# Results:
+#	Returns 1 if the year is a leap year, 0 otherwise.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::IsGregorianLeapYear { date } {
+switch -exact -- [dict get $date era] {
+	BCE {
+	    set year [expr { 1 - [dict get $date year]}]
+	}
+	CE {
+	    set year [dict get $date year]
+	}
+}
+if { $year % 4 != 0 } {
+	return 0
+} elseif { ![dict get $date gregorian] } {
+	return 1
+} elseif { $year % 400 == 0 } {
+	return 1
+} elseif { $year % 100 == 0 } {
+	return 0
+} else {
+	return 1
+}
+}
+#----------------------------------------------------------------------
+#
+# WeekdayOnOrBefore --
+#
+#	Determine the nearest day of week (given by the 'weekday' parameter,
+#	Sunday==0) on or before a given Julian Day.
+#
+# Parameters:
+#	weekday -- Day of the week
+#	j -- Julian Day number
+#
+# Results:
+#	Returns the Julian Day Number of the desired date.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::WeekdayOnOrBefore { weekday j } {
+set k [expr { ( $weekday + 6 )  % 7 }]
+return [expr { $j - ( $j - $k ) % 7 }]
+}
+#----------------------------------------------------------------------
+#
+# BSearch --
+#
+#	Service procedure that does binary search in several places inside the
+#	'clock' command.
+#
+# Parameters:
+#	list - List of lists, sorted in ascending order by the
+#	       first elements
+#	key - Value to search for
+#
+# Results:
+#	Returns the index of the greatest element in $list that is less than
+#	or equal to $key.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::BSearch { list key } {
+if {[llength $list] == 0} {
+	return -1
+}
+if { $key < [lindex $list 0 0] } {
+	return -1
+}
+set l 0
+set u [expr { [llength $list] - 1 }]
+while { $l < $u } {
+	# At this point, we know that
+	#   $k >= [lindex $list $l 0]
+	#   Either $u == [llength $list] or else $k < [lindex $list $u+1 0]
+	# We find the midpoint of the interval {l,u} rounded UP, compare
+	# against it, and set l or u to maintain the invariant.  Note that the
+	# interval shrinks at each step, guaranteeing convergence.
+	set m [expr { ( $l + $u + 1 ) / 2 }]
+	if { $key >= [lindex $list $m 0] } {
+	    set l $m
+	} else {
+	    set u [expr { $m - 1 }]
+	}
+}
+return $l
+}
+#----------------------------------------------------------------------
+#
+# clock add --
+#
+#	Adds an offset to a given time.
+#
+# Syntax:
+#	clock add clockval ?count unit?... ?-option value?
+#
+# Parameters:
+#	clockval -- Starting time value
+#	count -- Amount of a unit of time to add
+#	unit -- Unit of time to add, must be one of:
+#			years year months month weeks week
+#			days day hours hour minutes minute
+#			seconds second
+#
+# Options:
+#	-gmt BOOLEAN
+#		(Deprecated) Flag synonymous with '-timezone :GMT'
+#	-timezone ZONE
+#		Name of the time zone in which calculations are to be done.
+#	-locale NAME
+#		Name of the locale in which calculations are to be done.
+#		Used to determine the Gregorian change date.
+#
+# Results:
+#	Returns the given time adjusted by the given offset(s) in
+#	order.
+#
+# Notes:
+#	It is possible that adding a number of months or years will adjust the
+#	day of the month as well.  For instance, the time at one month after
+#	31 January is either 28 or 29 February, because February has fewer
+#	than 31 days.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::add { clockval args } {
+if { [llength $args] % 2 != 0 } {
+	set cmdName "clock add"
+	return -code error \
+	    -errorcode [list CLOCK wrongNumArgs] \
+	    "wrong \# args: should be\
+\"$cmdName clockval ?number units?...\
+?-gmt boolean? ?-locale LOCALE? ?-timezone ZONE?\""
+}
+if { [catch { expr {wide($clockval)} } result] } {
+	return -code error $result
+}
+set offsets {}
+set gmt 0
+set locale c
+set timezone [GetSystemTimeZone]
+foreach { a b } $args {
+	if { [string is integer -strict $a] } {
+	    lappend offsets $a $b
+	} else {
+	    switch -exact -- $a {
+		-g - -gm - -gmt {
+		    set gmt $b
+		}
+		-l - -lo - -loc - -loca - -local - -locale {
+		    set locale [string tolower $b]
+		}
+		-t - -ti - -tim - -time - -timez - -timezo - -timezon -
+		-timezone {
+		    set timezone $b
+		}
+		default {
+		    throw [list CLOCK badOption $a] \
+			"bad option \"$a\",\
+must be -gmt, -locale or -timezone"
+		}
+	    }
+	}
+}
+# Check options for validity
+if { [info exists saw(-gmt)] && [info exists saw(-timezone)] } {
+	return -code error \
+	    -errorcode [list CLOCK gmtWithTimezone] \
+	    "cannot use -gmt and -timezone in same call"
+}
+if { [catch { expr { wide($clockval) } } result] } {
+	return -code error "expected integer but got \"$clockval\""
+}
+if { ![string is boolean -strict $gmt] } {
+	return -code error "expected boolean value but got \"$gmt\""
+} elseif { $gmt } {
+	set timezone :GMT
+}
+EnterLocale $locale
+set changeover [mc GREGORIAN_CHANGE_DATE]
+if {[catch {SetupTimeZone $timezone} retval opts]} {
+	dict unset opts -errorinfo
+	return -options $opts $retval
+}
+try {
+	foreach { quantity unit } $offsets {
+	    switch -exact -- $unit {
+		years - year {
+		    set clockval [AddMonths [expr { 12 * $quantity }] \
+			    $clockval $timezone $changeover]
+		}
+		months - month {
+		    set clockval [AddMonths $quantity $clockval $timezone \
+			    $changeover]
+		}
+		weeks - week {
+		    set clockval [AddDays [expr { 7 * $quantity }] \
+			    $clockval $timezone $changeover]
+		}
+		days - day {
+		    set clockval [AddDays $quantity $clockval $timezone \
+			    $changeover]
+		}
+		hours - hour {
+		    set clockval [expr { 3600 * $quantity + $clockval }]
+		}
+		minutes - minute {
+		    set clockval [expr { 60 * $quantity + $clockval }]
+		}
+		seconds - second {
+		    set clockval [expr { $quantity + $clockval }]
+		}
+		default {
+		    throw [list CLOCK badUnit $unit] \
+			"unknown unit \"$unit\", must be \
+years, months, weeks, days, hours, minutes or seconds"
+		}
+	    }
+	}
+	return $clockval
+} trap CLOCK {result opts} {
+	# Conceal the innards of [clock] when it's an expected error
+	dict unset opts -errorinfo
+	return -options $opts $result
+}
+}
+#----------------------------------------------------------------------
+#
+# AddMonths --
+#
+#	Add a given number of months to a given clock value in a given
+#	time zone.
+#
+# Parameters:
+#	months - Number of months to add (may be negative)
+#	clockval - Seconds since the epoch before the operation
+#	timezone - Time zone in which the operation is to be performed
+#
+# Results:
+#	Returns the new clock value as a number of seconds since
+#	the epoch.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::AddMonths { months clockval timezone changeover } {
+variable DaysInRomanMonthInCommonYear
+variable DaysInRomanMonthInLeapYear
+variable TZData
+# Convert the time to year, month, day, and fraction of day.
+set date [GetDateFields $clockval $TZData($timezone) $changeover]
+dict set date secondOfDay [expr {
+	[dict get $date localSeconds] % 86400
+}]
+dict set date tzName $timezone
+# Add the requisite number of months
+set m [dict get $date month]
+incr m $months
+incr m -1
+set delta [expr { $m / 12 }]
+set mm [expr { $m % 12 }]
+dict set date month [expr { $mm + 1 }]
+dict incr date year $delta
+# If the date doesn't exist in the current month, repair it
+if { [IsGregorianLeapYear $date] } {
+	set hath [lindex $DaysInRomanMonthInLeapYear $mm]
+} else {
+	set hath [lindex $DaysInRomanMonthInCommonYear $mm]
+}
+if { [dict get $date dayOfMonth] > $hath } {
+	dict set date dayOfMonth $hath
+}
+# Reconvert to a number of seconds
+set date [GetJulianDayFromEraYearMonthDay \
+		  $date[set date {}]\
+		  $changeover]
+dict set date localSeconds [expr {
+	-210866803200
+	+ ( 86400 * wide([dict get $date julianDay]) )
+	+ [dict get $date secondOfDay]
+}]
+set date [ConvertLocalToUTC $date[set date {}] $TZData($timezone) \
+		 $changeover]
+return [dict get $date seconds]
+}
+#----------------------------------------------------------------------
+#
+# AddDays --
+#
+#	Add a given number of days to a given clock value in a given time
+#	zone.
+#
+# Parameters:
+#	days - Number of days to add (may be negative)
+#	clockval - Seconds since the epoch before the operation
+#	timezone - Time zone in which the operation is to be performed
+#	changeover - Julian Day on which the Gregorian calendar was adopted
+#		     in the target locale.
+#
+# Results:
+#	Returns the new clock value as a number of seconds since the epoch.
+#
+# Side effects:
+#	None.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::AddDays { days clockval timezone changeover } {
+variable TZData
+# Convert the time to Julian Day
+set date [GetDateFields $clockval $TZData($timezone) $changeover]
+dict set date secondOfDay [expr {
+	[dict get $date localSeconds] % 86400
+}]
+dict set date tzName $timezone
+# Add the requisite number of days
+dict incr date julianDay $days
+# Reconvert to a number of seconds
+dict set date localSeconds [expr {
+	-210866803200
+	+ ( 86400 * wide([dict get $date julianDay]) )
+	+ [dict get $date secondOfDay]
+}]
+set date [ConvertLocalToUTC $date[set date {}] $TZData($timezone) \
+		  $changeover]
+return [dict get $date seconds]
+}
+#----------------------------------------------------------------------
+#
+# ChangeCurrentLocale --
+#
+#        The global locale was changed within msgcat.
+#        Clears the buffered parse functions of the current locale.
+#
+# Parameters:
+#        loclist (ignored)
+#
+# Results:
+#        None.
+#
+# Side effects:
+#        Buffered parse functions are cleared.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ChangeCurrentLocale {args} {
+variable FormatProc
+variable LocaleNumeralCache
+variable CachedSystemTimeZone
+variable TimeZoneBad
+foreach p [info procs [namespace current]::scanproc'*'current] {
+rename $p {}
+}
+foreach p [info procs [namespace current]::formatproc'*'current] {
+rename $p {}
+}
+catch {array unset FormatProc *'current}
+set LocaleNumeralCache {}
+}
+#----------------------------------------------------------------------
+#
+# ClearCaches --
+#
+#	Clears all caches to reclaim the memory used in [clock]
+#
+# Parameters:
+#	None.
+#
+# Results:
+#	None.
+#
+# Side effects:
+#	Caches are cleared.
+#
+#----------------------------------------------------------------------
+proc ::tcl::clock::ClearCaches {} {
+variable FormatProc
+variable LocaleNumeralCache
+variable CachedSystemTimeZone
+variable TimeZoneBad
+foreach p [info procs [namespace current]::scanproc'*] {
+	rename $p {}
+}
+foreach p [info procs [namespace current]::formatproc'*] {
+	rename $p {}
+}
+catch {unset FormatProc}
+set LocaleNumeralCache {}
+catch {unset CachedSystemTimeZone}
+set TimeZoneBad {}
+InitTZData
+}

Mercurial > repos > rliterman > csp2

comparison CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/lib/tcl8.6/clock.tcl @ 69:33d812a61356