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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 ********************************************************************************
5 * Copyright (C) 1997-2013, International Business Machines *
6 * Corporation and others. All Rights Reserved. *
7 ********************************************************************************
8 *
9 * File SIMPLETZ.H
10 *
11 * Modification History:
12 *
13 * Date Name Description
14 * 04/21/97 aliu Overhauled header.
15 * 08/10/98 stephen JDK 1.2 sync
16 * Added setStartRule() / setEndRule() overloads
17 * Added hasSameRules()
18 * 09/02/98 stephen Added getOffset(monthLen)
19 * Changed getOffset() to take UErrorCode
20 * 07/09/99 stephen Removed millisPerHour (unused, for HP compiler)
21 * 12/02/99 aliu Added TimeMode and constructor and setStart/EndRule
22 * methods that take TimeMode. Added to docs.
23 ********************************************************************************
24 */
25
26 #ifndef SIMPLETZ_H
27 #define SIMPLETZ_H
28
29 #include "unicode/utypes.h"
30
31 #if U_SHOW_CPLUSPLUS_API
32
33 /**
34 * \file
35 * \brief C++ API: SimpleTimeZone is a concrete subclass of TimeZone.
36 */
37
38 #if !UCONFIG_NO_FORMATTING
39
40 #include "unicode/basictz.h"
41
42 U_NAMESPACE_BEGIN
43
44 // forward declaration
45 class InitialTimeZoneRule;
46 class TimeZoneTransition;
47 class AnnualTimeZoneRule;
48
49 /**
50 * <code>SimpleTimeZone</code> is a concrete subclass of <code>TimeZone</code>
51 * that represents a time zone for use with a Gregorian calendar. This
52 * class does not handle historical changes.
53 * <P>
54 * When specifying daylight-savings-time begin and end dates, use a negative value for
55 * <code>dayOfWeekInMonth</code> to indicate that <code>SimpleTimeZone</code> should
56 * count from the end of the month backwards. For example, if Daylight Savings
57 * Time starts or ends at the last Sunday a month, use <code>dayOfWeekInMonth = -1</code>
58 * along with <code>dayOfWeek = UCAL_SUNDAY</code> to specify the rule.
59 *
60 * @see Calendar
61 * @see GregorianCalendar
62 * @see TimeZone
63 * @author D. Goldsmith, Mark Davis, Chen-Lieh Huang, Alan Liu
64 */
65 class U_I18N_API SimpleTimeZone: public BasicTimeZone {
66 public:
67
68 /**
69 * TimeMode is used, together with a millisecond offset after
70 * midnight, to specify a rule transition time. Most rules
71 * transition at a local wall time, that is, according to the
72 * current time in effect, either standard, or DST. However, some
73 * rules transition at local standard time, and some at a specific
74 * UTC time. Although it might seem that all times could be
75 * converted to wall time, thus eliminating the need for this
76 * parameter, this is not the case.
77 * @stable ICU 2.0
78 */
79 enum TimeMode {
80 WALL_TIME = 0,
81 STANDARD_TIME,
82 UTC_TIME
83 };
84
85 /**
86 * Copy constructor
87 * @param source the object to be copied.
88 * @stable ICU 2.0
89 */
90 SimpleTimeZone(const SimpleTimeZone& source);
91
92 /**
93 * Default assignment operator
94 * @param right the object to be copied.
95 * @stable ICU 2.0
96 */
97 SimpleTimeZone& operator=(const SimpleTimeZone& right);
98
99 /**
100 * Destructor
101 * @stable ICU 2.0
102 */
103 virtual ~SimpleTimeZone();
104
105 /**
106 * Returns true if the two TimeZone objects are equal; that is, they have
107 * the same ID, raw GMT offset, and DST rules.
108 *
109 * @param that The SimpleTimeZone object to be compared with.
110 * @return True if the given time zone is equal to this time zone; false
111 * otherwise.
112 * @stable ICU 2.0
113 */
114 virtual UBool operator==(const TimeZone& that) const;
115
116 /**
117 * Constructs a SimpleTimeZone with the given raw GMT offset and time zone ID,
118 * and which doesn't observe daylight savings time. Normally you should use
119 * TimeZone::createInstance() to create a TimeZone instead of creating a
120 * SimpleTimeZone directly with this constructor.
121 *
122 * @param rawOffsetGMT The given base time zone offset to GMT.
123 * @param ID The timezone ID which is obtained from
124 * TimeZone.getAvailableIDs.
125 * @stable ICU 2.0
126 */
127 SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID);
128
129 /**
130 * Construct a SimpleTimeZone with the given raw GMT offset, time zone ID,
131 * and times to start and end daylight savings time. To create a TimeZone that
132 * doesn't observe daylight savings time, don't use this constructor; use
133 * SimpleTimeZone(rawOffset, ID) instead. Normally, you should use
134 * TimeZone.createInstance() to create a TimeZone instead of creating a
135 * SimpleTimeZone directly with this constructor.
136 * <P>
137 * Various types of daylight-savings time rules can be specfied by using different
138 * values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a
139 * complete explanation of how these parameters work, see the documentation for
140 * setStartRule().
141 *
142 * @param rawOffsetGMT The new SimpleTimeZone's raw GMT offset
143 * @param ID The new SimpleTimeZone's time zone ID.
144 * @param savingsStartMonth The daylight savings starting month. Month is
145 * 0-based. eg, 0 for January.
146 * @param savingsStartDayOfWeekInMonth The daylight savings starting
147 * day-of-week-in-month. See setStartRule() for a
148 * complete explanation.
149 * @param savingsStartDayOfWeek The daylight savings starting day-of-week.
150 * See setStartRule() for a complete explanation.
151 * @param savingsStartTime The daylight savings starting time, expressed as the
152 * number of milliseconds after midnight.
153 * @param savingsEndMonth The daylight savings ending month. Month is
154 * 0-based. eg, 0 for January.
155 * @param savingsEndDayOfWeekInMonth The daylight savings ending day-of-week-in-month.
156 * See setStartRule() for a complete explanation.
157 * @param savingsEndDayOfWeek The daylight savings ending day-of-week.
158 * See setStartRule() for a complete explanation.
159 * @param savingsEndTime The daylight savings ending time, expressed as the
160 * number of milliseconds after midnight.
161 * @param status An UErrorCode to receive the status.
162 * @stable ICU 2.0
163 */
164 SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
165 int8_t savingsStartMonth, int8_t savingsStartDayOfWeekInMonth,
166 int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
167 int8_t savingsEndMonth, int8_t savingsEndDayOfWeekInMonth,
168 int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
169 UErrorCode& status);
170 /**
171 * Construct a SimpleTimeZone with the given raw GMT offset, time zone ID,
172 * and times to start and end daylight savings time. To create a TimeZone that
173 * doesn't observe daylight savings time, don't use this constructor; use
174 * SimpleTimeZone(rawOffset, ID) instead. Normally, you should use
175 * TimeZone.createInstance() to create a TimeZone instead of creating a
176 * SimpleTimeZone directly with this constructor.
177 * <P>
178 * Various types of daylight-savings time rules can be specfied by using different
179 * values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a
180 * complete explanation of how these parameters work, see the documentation for
181 * setStartRule().
182 *
183 * @param rawOffsetGMT The new SimpleTimeZone's raw GMT offset
184 * @param ID The new SimpleTimeZone's time zone ID.
185 * @param savingsStartMonth The daylight savings starting month. Month is
186 * 0-based. eg, 0 for January.
187 * @param savingsStartDayOfWeekInMonth The daylight savings starting
188 * day-of-week-in-month. See setStartRule() for a
189 * complete explanation.
190 * @param savingsStartDayOfWeek The daylight savings starting day-of-week.
191 * See setStartRule() for a complete explanation.
192 * @param savingsStartTime The daylight savings starting time, expressed as the
193 * number of milliseconds after midnight.
194 * @param savingsEndMonth The daylight savings ending month. Month is
195 * 0-based. eg, 0 for January.
196 * @param savingsEndDayOfWeekInMonth The daylight savings ending day-of-week-in-month.
197 * See setStartRule() for a complete explanation.
198 * @param savingsEndDayOfWeek The daylight savings ending day-of-week.
199 * See setStartRule() for a complete explanation.
200 * @param savingsEndTime The daylight savings ending time, expressed as the
201 * number of milliseconds after midnight.
202 * @param savingsDST The number of milliseconds added to standard time
203 * to get DST time. Default is one hour.
204 * @param status An UErrorCode to receive the status.
205 * @stable ICU 2.0
206 */
207 SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
208 int8_t savingsStartMonth, int8_t savingsStartDayOfWeekInMonth,
209 int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
210 int8_t savingsEndMonth, int8_t savingsEndDayOfWeekInMonth,
211 int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
212 int32_t savingsDST, UErrorCode& status);
213
214 /**
215 * Construct a SimpleTimeZone with the given raw GMT offset, time zone ID,
216 * and times to start and end daylight savings time. To create a TimeZone that
217 * doesn't observe daylight savings time, don't use this constructor; use
218 * SimpleTimeZone(rawOffset, ID) instead. Normally, you should use
219 * TimeZone.createInstance() to create a TimeZone instead of creating a
220 * SimpleTimeZone directly with this constructor.
221 * <P>
222 * Various types of daylight-savings time rules can be specfied by using different
223 * values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a
224 * complete explanation of how these parameters work, see the documentation for
225 * setStartRule().
226 *
227 * @param rawOffsetGMT The new SimpleTimeZone's raw GMT offset
228 * @param ID The new SimpleTimeZone's time zone ID.
229 * @param savingsStartMonth The daylight savings starting month. Month is
230 * 0-based. eg, 0 for January.
231 * @param savingsStartDayOfWeekInMonth The daylight savings starting
232 * day-of-week-in-month. See setStartRule() for a
233 * complete explanation.
234 * @param savingsStartDayOfWeek The daylight savings starting day-of-week.
235 * See setStartRule() for a complete explanation.
236 * @param savingsStartTime The daylight savings starting time, expressed as the
237 * number of milliseconds after midnight.
238 * @param savingsStartTimeMode Whether the start time is local wall time, local
239 * standard time, or UTC time. Default is local wall time.
240 * @param savingsEndMonth The daylight savings ending month. Month is
241 * 0-based. eg, 0 for January.
242 * @param savingsEndDayOfWeekInMonth The daylight savings ending day-of-week-in-month.
243 * See setStartRule() for a complete explanation.
244 * @param savingsEndDayOfWeek The daylight savings ending day-of-week.
245 * See setStartRule() for a complete explanation.
246 * @param savingsEndTime The daylight savings ending time, expressed as the
247 * number of milliseconds after midnight.
248 * @param savingsEndTimeMode Whether the end time is local wall time, local
249 * standard time, or UTC time. Default is local wall time.
250 * @param savingsDST The number of milliseconds added to standard time
251 * to get DST time. Default is one hour.
252 * @param status An UErrorCode to receive the status.
253 * @stable ICU 2.0
254 */
255 SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
256 int8_t savingsStartMonth, int8_t savingsStartDayOfWeekInMonth,
257 int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
258 TimeMode savingsStartTimeMode,
259 int8_t savingsEndMonth, int8_t savingsEndDayOfWeekInMonth,
260 int8_t savingsEndDayOfWeek, int32_t savingsEndTime, TimeMode savingsEndTimeMode,
261 int32_t savingsDST, UErrorCode& status);
262
263 /**
264 * Sets the daylight savings starting year, that is, the year this time zone began
265 * observing its specified daylight savings time rules. The time zone is considered
266 * not to observe daylight savings time prior to that year; SimpleTimeZone doesn't
267 * support historical daylight-savings-time rules.
268 * @param year the daylight savings starting year.
269 * @stable ICU 2.0
270 */
271 void setStartYear(int32_t year);
272
273 /**
274 * Sets the daylight savings starting rule. For example, in the U.S., Daylight Savings
275 * Time starts at the second Sunday in March, at 2 AM in standard time.
276 * Therefore, you can set the start rule by calling:
277 * setStartRule(UCAL_MARCH, 2, UCAL_SUNDAY, 2*60*60*1000);
278 * The dayOfWeekInMonth and dayOfWeek parameters together specify how to calculate
279 * the exact starting date. Their exact meaning depend on their respective signs,
280 * allowing various types of rules to be constructed, as follows:
281 * <ul>
282 * <li>If both dayOfWeekInMonth and dayOfWeek are positive, they specify the
283 * day of week in the month (e.g., (2, WEDNESDAY) is the second Wednesday
284 * of the month).</li>
285 * <li>If dayOfWeek is positive and dayOfWeekInMonth is negative, they specify
286 * the day of week in the month counting backward from the end of the month.
287 * (e.g., (-1, MONDAY) is the last Monday in the month)</li>
288 * <li>If dayOfWeek is zero and dayOfWeekInMonth is positive, dayOfWeekInMonth
289 * specifies the day of the month, regardless of what day of the week it is.
290 * (e.g., (10, 0) is the tenth day of the month)</li>
291 * <li>If dayOfWeek is zero and dayOfWeekInMonth is negative, dayOfWeekInMonth
292 * specifies the day of the month counting backward from the end of the
293 * month, regardless of what day of the week it is (e.g., (-2, 0) is the
294 * next-to-last day of the month).</li>
295 * <li>If dayOfWeek is negative and dayOfWeekInMonth is positive, they specify the
296 * first specified day of the week on or after the specfied day of the month.
297 * (e.g., (15, -SUNDAY) is the first Sunday after the 15th of the month
298 * [or the 15th itself if the 15th is a Sunday].)</li>
299 * <li>If dayOfWeek and DayOfWeekInMonth are both negative, they specify the
300 * last specified day of the week on or before the specified day of the month.
301 * (e.g., (-20, -TUESDAY) is the last Tuesday before the 20th of the month
302 * [or the 20th itself if the 20th is a Tuesday].)</li>
303 * </ul>
304 * @param month the daylight savings starting month. Month is 0-based.
305 * eg, 0 for January.
306 * @param dayOfWeekInMonth the daylight savings starting
307 * day-of-week-in-month. Please see the member description for an example.
308 * @param dayOfWeek the daylight savings starting day-of-week. Please see
309 * the member description for an example.
310 * @param time the daylight savings starting time. Please see the member
311 * description for an example.
312 * @param status An UErrorCode
313 * @stable ICU 2.0
314 */
315 void setStartRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
316 int32_t time, UErrorCode& status);
317 /**
318 * Sets the daylight savings starting rule. For example, in the U.S., Daylight Savings
319 * Time starts at the second Sunday in March, at 2 AM in standard time.
320 * Therefore, you can set the start rule by calling:
321 * setStartRule(UCAL_MARCH, 2, UCAL_SUNDAY, 2*60*60*1000);
322 * The dayOfWeekInMonth and dayOfWeek parameters together specify how to calculate
323 * the exact starting date. Their exact meaning depend on their respective signs,
324 * allowing various types of rules to be constructed, as follows:
325 * <ul>
326 * <li>If both dayOfWeekInMonth and dayOfWeek are positive, they specify the
327 * day of week in the month (e.g., (2, WEDNESDAY) is the second Wednesday
328 * of the month).</li>
329 * <li>If dayOfWeek is positive and dayOfWeekInMonth is negative, they specify
330 * the day of week in the month counting backward from the end of the month.
331 * (e.g., (-1, MONDAY) is the last Monday in the month)</li>
332 * <li>If dayOfWeek is zero and dayOfWeekInMonth is positive, dayOfWeekInMonth
333 * specifies the day of the month, regardless of what day of the week it is.
334 * (e.g., (10, 0) is the tenth day of the month)</li>
335 * <li>If dayOfWeek is zero and dayOfWeekInMonth is negative, dayOfWeekInMonth
336 * specifies the day of the month counting backward from the end of the
337 * month, regardless of what day of the week it is (e.g., (-2, 0) is the
338 * next-to-last day of the month).</li>
339 * <li>If dayOfWeek is negative and dayOfWeekInMonth is positive, they specify the
340 * first specified day of the week on or after the specfied day of the month.
341 * (e.g., (15, -SUNDAY) is the first Sunday after the 15th of the month
342 * [or the 15th itself if the 15th is a Sunday].)</li>
343 * <li>If dayOfWeek and DayOfWeekInMonth are both negative, they specify the
344 * last specified day of the week on or before the specified day of the month.
345 * (e.g., (-20, -TUESDAY) is the last Tuesday before the 20th of the month
346 * [or the 20th itself if the 20th is a Tuesday].)</li>
347 * </ul>
348 * @param month the daylight savings starting month. Month is 0-based.
349 * eg, 0 for January.
350 * @param dayOfWeekInMonth the daylight savings starting
351 * day-of-week-in-month. Please see the member description for an example.
352 * @param dayOfWeek the daylight savings starting day-of-week. Please see
353 * the member description for an example.
354 * @param time the daylight savings starting time. Please see the member
355 * description for an example.
356 * @param mode whether the time is local wall time, local standard time,
357 * or UTC time. Default is local wall time.
358 * @param status An UErrorCode
359 * @stable ICU 2.0
360 */
361 void setStartRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
362 int32_t time, TimeMode mode, UErrorCode& status);
363
364 /**
365 * Sets the DST start rule to a fixed date within a month.
366 *
367 * @param month The month in which this rule occurs (0-based).
368 * @param dayOfMonth The date in that month (1-based).
369 * @param time The time of that day (number of millis after midnight)
370 * when DST takes effect in local wall time, which is
371 * standard time in this case.
372 * @param status An UErrorCode
373 * @stable ICU 2.0
374 */
375 void setStartRule(int32_t month, int32_t dayOfMonth, int32_t time,
376 UErrorCode& status);
377 /**
378 * Sets the DST start rule to a fixed date within a month.
379 *
380 * @param month The month in which this rule occurs (0-based).
381 * @param dayOfMonth The date in that month (1-based).
382 * @param time The time of that day (number of millis after midnight)
383 * when DST takes effect in local wall time, which is
384 * standard time in this case.
385 * @param mode whether the time is local wall time, local standard time,
386 * or UTC time. Default is local wall time.
387 * @param status An UErrorCode
388 * @stable ICU 2.0
389 */
390 void setStartRule(int32_t month, int32_t dayOfMonth, int32_t time,
391 TimeMode mode, UErrorCode& status);
392
393 /**
394 * Sets the DST start rule to a weekday before or after a give date within
395 * a month, e.g., the first Monday on or after the 8th.
396 *
397 * @param month The month in which this rule occurs (0-based).
398 * @param dayOfMonth A date within that month (1-based).
399 * @param dayOfWeek The day of the week on which this rule occurs.
400 * @param time The time of that day (number of millis after midnight)
401 * when DST takes effect in local wall time, which is
402 * standard time in this case.
403 * @param after If true, this rule selects the first dayOfWeek on
404 * or after dayOfMonth. If false, this rule selects
405 * the last dayOfWeek on or before dayOfMonth.
406 * @param status An UErrorCode
407 * @stable ICU 2.0
408 */
409 void setStartRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
410 int32_t time, UBool after, UErrorCode& status);
411 /**
412 * Sets the DST start rule to a weekday before or after a give date within
413 * a month, e.g., the first Monday on or after the 8th.
414 *
415 * @param month The month in which this rule occurs (0-based).
416 * @param dayOfMonth A date within that month (1-based).
417 * @param dayOfWeek The day of the week on which this rule occurs.
418 * @param time The time of that day (number of millis after midnight)
419 * when DST takes effect in local wall time, which is
420 * standard time in this case.
421 * @param mode whether the time is local wall time, local standard time,
422 * or UTC time. Default is local wall time.
423 * @param after If true, this rule selects the first dayOfWeek on
424 * or after dayOfMonth. If false, this rule selects
425 * the last dayOfWeek on or before dayOfMonth.
426 * @param status An UErrorCode
427 * @stable ICU 2.0
428 */
429 void setStartRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
430 int32_t time, TimeMode mode, UBool after, UErrorCode& status);
431
432 /**
433 * Sets the daylight savings ending rule. For example, if Daylight
434 * Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time.
435 * Therefore, you can set the end rule by calling:
436 * <pre>
437 * setEndRule(UCAL_OCTOBER, -1, UCAL_SUNDAY, 2*60*60*1000);
438 * </pre>
439 * Various other types of rules can be specified by manipulating the dayOfWeek
440 * and dayOfWeekInMonth parameters. For complete details, see the documentation
441 * for setStartRule().
442 *
443 * @param month the daylight savings ending month. Month is 0-based.
444 * eg, 0 for January.
445 * @param dayOfWeekInMonth the daylight savings ending
446 * day-of-week-in-month. See setStartRule() for a complete explanation.
447 * @param dayOfWeek the daylight savings ending day-of-week. See setStartRule()
448 * for a complete explanation.
449 * @param time the daylight savings ending time. Please see the member
450 * description for an example.
451 * @param status An UErrorCode
452 * @stable ICU 2.0
453 */
454 void setEndRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
455 int32_t time, UErrorCode& status);
456
457 /**
458 * Sets the daylight savings ending rule. For example, if Daylight
459 * Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time.
460 * Therefore, you can set the end rule by calling:
461 * <pre>
462 * setEndRule(UCAL_OCTOBER, -1, UCAL_SUNDAY, 2*60*60*1000);
463 * </pre>
464 * Various other types of rules can be specified by manipulating the dayOfWeek
465 * and dayOfWeekInMonth parameters. For complete details, see the documentation
466 * for setStartRule().
467 *
468 * @param month the daylight savings ending month. Month is 0-based.
469 * eg, 0 for January.
470 * @param dayOfWeekInMonth the daylight savings ending
471 * day-of-week-in-month. See setStartRule() for a complete explanation.
472 * @param dayOfWeek the daylight savings ending day-of-week. See setStartRule()
473 * for a complete explanation.
474 * @param time the daylight savings ending time. Please see the member
475 * description for an example.
476 * @param mode whether the time is local wall time, local standard time,
477 * or UTC time. Default is local wall time.
478 * @param status An UErrorCode
479 * @stable ICU 2.0
480 */
481 void setEndRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
482 int32_t time, TimeMode mode, UErrorCode& status);
483
484 /**
485 * Sets the DST end rule to a fixed date within a month.
486 *
487 * @param month The month in which this rule occurs (0-based).
488 * @param dayOfMonth The date in that month (1-based).
489 * @param time The time of that day (number of millis after midnight)
490 * when DST ends in local wall time, which is daylight
491 * time in this case.
492 * @param status An UErrorCode
493 * @stable ICU 2.0
494 */
495 void setEndRule(int32_t month, int32_t dayOfMonth, int32_t time, UErrorCode& status);
496
497 /**
498 * Sets the DST end rule to a fixed date within a month.
499 *
500 * @param month The month in which this rule occurs (0-based).
501 * @param dayOfMonth The date in that month (1-based).
502 * @param time The time of that day (number of millis after midnight)
503 * when DST ends in local wall time, which is daylight
504 * time in this case.
505 * @param mode whether the time is local wall time, local standard time,
506 * or UTC time. Default is local wall time.
507 * @param status An UErrorCode
508 * @stable ICU 2.0
509 */
510 void setEndRule(int32_t month, int32_t dayOfMonth, int32_t time,
511 TimeMode mode, UErrorCode& status);
512
513 /**
514 * Sets the DST end rule to a weekday before or after a give date within
515 * a month, e.g., the first Monday on or after the 8th.
516 *
517 * @param month The month in which this rule occurs (0-based).
518 * @param dayOfMonth A date within that month (1-based).
519 * @param dayOfWeek The day of the week on which this rule occurs.
520 * @param time The time of that day (number of millis after midnight)
521 * when DST ends in local wall time, which is daylight
522 * time in this case.
523 * @param after If true, this rule selects the first dayOfWeek on
524 * or after dayOfMonth. If false, this rule selects
525 * the last dayOfWeek on or before dayOfMonth.
526 * @param status An UErrorCode
527 * @stable ICU 2.0
528 */
529 void setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
530 int32_t time, UBool after, UErrorCode& status);
531
532 /**
533 * Sets the DST end rule to a weekday before or after a give date within
534 * a month, e.g., the first Monday on or after the 8th.
535 *
536 * @param month The month in which this rule occurs (0-based).
537 * @param dayOfMonth A date within that month (1-based).
538 * @param dayOfWeek The day of the week on which this rule occurs.
539 * @param time The time of that day (number of millis after midnight)
540 * when DST ends in local wall time, which is daylight
541 * time in this case.
542 * @param mode whether the time is local wall time, local standard time,
543 * or UTC time. Default is local wall time.
544 * @param after If true, this rule selects the first dayOfWeek on
545 * or after dayOfMonth. If false, this rule selects
546 * the last dayOfWeek on or before dayOfMonth.
547 * @param status An UErrorCode
548 * @stable ICU 2.0
549 */
550 void setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
551 int32_t time, TimeMode mode, UBool after, UErrorCode& status);
552
553 /**
554 * Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add
555 * to GMT to get local time in this time zone, taking daylight savings time into
556 * account) as of a particular reference date. The reference date is used to determine
557 * whether daylight savings time is in effect and needs to be figured into the offset
558 * that is returned (in other words, what is the adjusted GMT offset in this time zone
559 * at this particular date and time?). For the time zones produced by createTimeZone(),
560 * the reference data is specified according to the Gregorian calendar, and the date
561 * and time fields are in GMT, NOT local time.
562 *
563 * @param era The reference date's era
564 * @param year The reference date's year
565 * @param month The reference date's month (0-based; 0 is January)
566 * @param day The reference date's day-in-month (1-based)
567 * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday)
568 * @param millis The reference date's milliseconds in day, UTT (NOT local time).
569 * @param status An UErrorCode to receive the status.
570 * @return The offset in milliseconds to add to GMT to get local time.
571 * @stable ICU 2.0
572 */
573 virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
574 uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const;
575
576 /**
577 * Gets the time zone offset, for current date, modified in case of
578 * daylight savings. This is the offset to add *to* UTC to get local time.
579 * @param era the era of the given date.
580 * @param year the year in the given date.
581 * @param month the month in the given date.
582 * Month is 0-based. e.g., 0 for January.
583 * @param day the day-in-month of the given date.
584 * @param dayOfWeek the day-of-week of the given date.
585 * @param milliseconds the millis in day in <em>standard</em> local time.
586 * @param monthLength the length of the given month in days.
587 * @param status An UErrorCode to receive the status.
588 * @return the offset to add *to* GMT to get local time.
589 * @stable ICU 2.0
590 */
591 virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
592 uint8_t dayOfWeek, int32_t milliseconds,
593 int32_t monthLength, UErrorCode& status) const;
594 /**
595 * Gets the time zone offset, for current date, modified in case of
596 * daylight savings. This is the offset to add *to* UTC to get local time.
597 * @param era the era of the given date.
598 * @param year the year in the given date.
599 * @param month the month in the given date.
600 * Month is 0-based. e.g., 0 for January.
601 * @param day the day-in-month of the given date.
602 * @param dayOfWeek the day-of-week of the given date.
603 * @param milliseconds the millis in day in <em>standard</em> local time.
604 * @param monthLength the length of the given month in days.
605 * @param prevMonthLength length of the previous month in days.
606 * @param status An UErrorCode to receive the status.
607 * @return the offset to add *to* GMT to get local time.
608 * @stable ICU 2.0
609 */
610 virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
611 uint8_t dayOfWeek, int32_t milliseconds,
612 int32_t monthLength, int32_t prevMonthLength,
613 UErrorCode& status) const;
614
615 /**
616 * Redeclared TimeZone method. This implementation simply calls
617 * the base class method, which otherwise would be hidden.
618 * @stable ICU 2.8
619 */
620 virtual void getOffset(UDate date, UBool local, int32_t& rawOffset,
621 int32_t& dstOffset, UErrorCode& ec) const;
622
623 /**
624 * Get time zone offsets from local wall time.
625 * @internal
626 */
627 virtual void getOffsetFromLocal(UDate date, int32_t nonExistingTimeOpt, int32_t duplicatedTimeOpt,
628 int32_t& rawOffset, int32_t& dstOffset, UErrorCode& status) const;
629
630 /**
631 * Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
632 * to GMT to get local time, before taking daylight savings time into account).
633 *
634 * @return The TimeZone's raw GMT offset.
635 * @stable ICU 2.0
636 */
637 virtual int32_t getRawOffset(void) const;
638
639 /**
640 * Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
641 * to GMT to get local time, before taking daylight savings time into account).
642 *
643 * @param offsetMillis The new raw GMT offset for this time zone.
644 * @stable ICU 2.0
645 */
646 virtual void setRawOffset(int32_t offsetMillis);
647
648 /**
649 * Sets the amount of time in ms that the clock is advanced during DST.
650 * @param millisSavedDuringDST the number of milliseconds the time is
651 * advanced with respect to standard time when the daylight savings rules
652 * are in effect. Typically one hour (+3600000). The amount could be negative,
653 * but not 0.
654 * @param status An UErrorCode to receive the status.
655 * @stable ICU 2.0
656 */
657 void setDSTSavings(int32_t millisSavedDuringDST, UErrorCode& status);
658
659 /**
660 * Returns the amount of time in ms that the clock is advanced during DST.
661 * @return the number of milliseconds the time is
662 * advanced with respect to standard time when the daylight savings rules
663 * are in effect. Typically one hour (+3600000). The amount could be negative,
664 * but not 0.
665 * @stable ICU 2.0
666 */
667 virtual int32_t getDSTSavings(void) const;
668
669 /**
670 * Queries if this TimeZone uses Daylight Savings Time.
671 *
672 * @return True if this TimeZone uses Daylight Savings Time; false otherwise.
673 * @stable ICU 2.0
674 */
675 virtual UBool useDaylightTime(void) const;
676
677 #ifndef U_FORCE_HIDE_DEPRECATED_API
678 /**
679 * Returns true if the given date is within the period when daylight savings time
680 * is in effect; false otherwise. If the TimeZone doesn't observe daylight savings
681 * time, this functions always returns false.
682 * This method is wasteful since it creates a new GregorianCalendar and
683 * deletes it each time it is called. This is a deprecated method
684 * and provided only for Java compatibility.
685 *
686 * @param date The date to test.
687 * @param status An UErrorCode to receive the status.
688 * @return true if the given date is in Daylight Savings Time;
689 * false otherwise.
690 * @deprecated ICU 2.4. Use Calendar::inDaylightTime() instead.
691 */
692 virtual UBool inDaylightTime(UDate date, UErrorCode& status) const;
693 #endif // U_FORCE_HIDE_DEPRECATED_API
694
695 /**
696 * Return true if this zone has the same rules and offset as another zone.
697 * @param other the TimeZone object to be compared with
698 * @return true if the given zone has the same rules and offset as this one
699 * @stable ICU 2.0
700 */
701 UBool hasSameRules(const TimeZone& other) const;
702
703 /**
704 * Clones TimeZone objects polymorphically. Clients are responsible for deleting
705 * the TimeZone object cloned.
706 *
707 * @return A new copy of this TimeZone object.
708 * @stable ICU 2.0
709 */
710 virtual SimpleTimeZone* clone() const;
711
712 /**
713 * Gets the first time zone transition after the base time.
714 * @param base The base time.
715 * @param inclusive Whether the base time is inclusive or not.
716 * @param result Receives the first transition after the base time.
717 * @return TRUE if the transition is found.
718 * @stable ICU 3.8
719 */
720 virtual UBool getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const;
721
722 /**
723 * Gets the most recent time zone transition before the base time.
724 * @param base The base time.
725 * @param inclusive Whether the base time is inclusive or not.
726 * @param result Receives the most recent transition before the base time.
727 * @return TRUE if the transition is found.
728 * @stable ICU 3.8
729 */
730 virtual UBool getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) const;
731
732 /**
733 * Returns the number of <code>TimeZoneRule</code>s which represents time transitions,
734 * for this time zone, that is, all <code>TimeZoneRule</code>s for this time zone except
735 * <code>InitialTimeZoneRule</code>. The return value range is 0 or any positive value.
736 * @param status Receives error status code.
737 * @return The number of <code>TimeZoneRule</code>s representing time transitions.
738 * @stable ICU 3.8
739 */
740 virtual int32_t countTransitionRules(UErrorCode& status) const;
741
742 /**
743 * Gets the <code>InitialTimeZoneRule</code> and the set of <code>TimeZoneRule</code>
744 * which represent time transitions for this time zone. On successful return,
745 * the argument initial points to non-NULL <code>InitialTimeZoneRule</code> and
746 * the array trsrules is filled with 0 or multiple <code>TimeZoneRule</code>
747 * instances up to the size specified by trscount. The results are referencing the
748 * rule instance held by this time zone instance. Therefore, after this time zone
749 * is destructed, they are no longer available.
750 * @param initial Receives the initial timezone rule
751 * @param trsrules Receives the timezone transition rules
752 * @param trscount On input, specify the size of the array 'transitions' receiving
753 * the timezone transition rules. On output, actual number of
754 * rules filled in the array will be set.
755 * @param status Receives error status code.
756 * @stable ICU 3.8
757 */
758 virtual void getTimeZoneRules(const InitialTimeZoneRule*& initial,
759 const TimeZoneRule* trsrules[], int32_t& trscount, UErrorCode& status) const;
760
761
762 public:
763
764 /**
765 * Override TimeZone Returns a unique class ID POLYMORPHICALLY. Pure virtual
766 * override. This method is to implement a simple version of RTTI, since not all C++
767 * compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
768 * this method.
769 *
770 * @return The class ID for this object. All objects of a given class have the
771 * same class ID. Objects of other classes have different class IDs.
772 * @stable ICU 2.0
773 */
774 virtual UClassID getDynamicClassID(void) const;
775
776 /**
777 * Return the class ID for this class. This is useful only for comparing to a return
778 * value from getDynamicClassID(). For example:
779 * <pre>
780 * . Base* polymorphic_pointer = createPolymorphicObject();
781 * . if (polymorphic_pointer->getDynamicClassID() ==
782 * . Derived::getStaticClassID()) ...
783 * </pre>
784 * @return The class ID for all objects of this class.
785 * @stable ICU 2.0
786 */
787 static UClassID U_EXPORT2 getStaticClassID(void);
788
789 private:
790 /**
791 * Constants specifying values of startMode and endMode.
792 */
793 enum EMode
794 {
795 DOM_MODE = 1,
796 DOW_IN_MONTH_MODE,
797 DOW_GE_DOM_MODE,
798 DOW_LE_DOM_MODE
799 };
800
801 SimpleTimeZone(); // default constructor not implemented
802
803 /**
804 * Internal construction method.
805 * @param rawOffsetGMT The new SimpleTimeZone's raw GMT offset
806 * @param startMonth the month DST starts
807 * @param startDay the day DST starts
808 * @param startDayOfWeek the DOW DST starts
809 * @param startTime the time DST starts
810 * @param startTimeMode Whether the start time is local wall time, local
811 * standard time, or UTC time. Default is local wall time.
812 * @param endMonth the month DST ends
813 * @param endDay the day DST ends
814 * @param endDayOfWeek the DOW DST ends
815 * @param endTime the time DST ends
816 * @param endTimeMode Whether the end time is local wall time, local
817 * standard time, or UTC time. Default is local wall time.
818 * @param dstSavings The number of milliseconds added to standard time
819 * to get DST time. Default is one hour.
820 * @param status An UErrorCode to receive the status.
821 */
822 void construct(int32_t rawOffsetGMT,
823 int8_t startMonth, int8_t startDay, int8_t startDayOfWeek,
824 int32_t startTime, TimeMode startTimeMode,
825 int8_t endMonth, int8_t endDay, int8_t endDayOfWeek,
826 int32_t endTime, TimeMode endTimeMode,
827 int32_t dstSavings, UErrorCode& status);
828
829 /**
830 * Compare a given date in the year to a rule. Return 1, 0, or -1, depending
831 * on whether the date is after, equal to, or before the rule date. The
832 * millis are compared directly against the ruleMillis, so any
833 * standard-daylight adjustments must be handled by the caller.
834 *
835 * @return 1 if the date is after the rule date, -1 if the date is before
836 * the rule date, or 0 if the date is equal to the rule date.
837 */
838 static int32_t compareToRule(int8_t month, int8_t monthLen, int8_t prevMonthLen,
839 int8_t dayOfMonth,
840 int8_t dayOfWeek, int32_t millis, int32_t millisDelta,
841 EMode ruleMode, int8_t ruleMonth, int8_t ruleDayOfWeek,
842 int8_t ruleDay, int32_t ruleMillis);
843
844 /**
845 * Given a set of encoded rules in startDay and startDayOfMonth, decode
846 * them and set the startMode appropriately. Do the same for endDay and
847 * endDayOfMonth.
848 * <P>
849 * Upon entry, the day of week variables may be zero or
850 * negative, in order to indicate special modes. The day of month
851 * variables may also be negative.
852 * <P>
853 * Upon exit, the mode variables will be
854 * set, and the day of week and day of month variables will be positive.
855 * <P>
856 * This method also recognizes a startDay or endDay of zero as indicating
857 * no DST.
858 */
859 void decodeRules(UErrorCode& status);
860 void decodeStartRule(UErrorCode& status);
861 void decodeEndRule(UErrorCode& status);
862
863 int8_t startMonth, startDay, startDayOfWeek; // the month, day, DOW, and time DST starts
864 int32_t startTime;
865 TimeMode startTimeMode, endTimeMode; // Mode for startTime, endTime; see TimeMode
866 int8_t endMonth, endDay, endDayOfWeek; // the month, day, DOW, and time DST ends
867 int32_t endTime;
868 int32_t startYear; // the year these DST rules took effect
869 int32_t rawOffset; // the TimeZone's raw GMT offset
870 UBool useDaylight; // flag indicating whether this TimeZone uses DST
871 static const int8_t STATICMONTHLENGTH[12]; // lengths of the months
872 EMode startMode, endMode; // flags indicating what kind of rules the DST rules are
873
874 /**
875 * A positive value indicating the amount of time saved during DST in ms.
876 * Typically one hour; sometimes 30 minutes.
877 */
878 int32_t dstSavings;
879
880 /* Private for BasicTimeZone implementation */
881 void checkTransitionRules(UErrorCode& status) const;
882 void initTransitionRules(UErrorCode& status);
883 void clearTransitionRules(void);
884 void deleteTransitionRules(void);
885 UBool transitionRulesInitialized;
886 InitialTimeZoneRule* initialRule;
887 TimeZoneTransition* firstTransition;
888 AnnualTimeZoneRule* stdRule;
889 AnnualTimeZoneRule* dstRule;
890 };
891
892 inline void SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfWeekInMonth,
893 int32_t dayOfWeek,
894 int32_t time, UErrorCode& status) {
895 setStartRule(month, dayOfWeekInMonth, dayOfWeek, time, WALL_TIME, status);
896 }
897
898 inline void SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth,
899 int32_t time,
900 UErrorCode& status) {
901 setStartRule(month, dayOfMonth, time, WALL_TIME, status);
902 }
903
904 inline void SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth,
905 int32_t dayOfWeek,
906 int32_t time, UBool after, UErrorCode& status) {
907 setStartRule(month, dayOfMonth, dayOfWeek, time, WALL_TIME, after, status);
908 }
909
910 inline void SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfWeekInMonth,
911 int32_t dayOfWeek,
912 int32_t time, UErrorCode& status) {
913 setEndRule(month, dayOfWeekInMonth, dayOfWeek, time, WALL_TIME, status);
914 }
915
916 inline void SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth,
917 int32_t time, UErrorCode& status) {
918 setEndRule(month, dayOfMonth, time, WALL_TIME, status);
919 }
920
921 inline void SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
922 int32_t time, UBool after, UErrorCode& status) {
923 setEndRule(month, dayOfMonth, dayOfWeek, time, WALL_TIME, after, status);
924 }
925
926 inline void
927 SimpleTimeZone::getOffset(UDate date, UBool local, int32_t& rawOffsetRef,
928 int32_t& dstOffsetRef, UErrorCode& ec) const {
929 TimeZone::getOffset(date, local, rawOffsetRef, dstOffsetRef, ec);
930 }
931
932 U_NAMESPACE_END
933
934 #endif /* #if !UCONFIG_NO_FORMATTING */
935
936 #endif /* U_SHOW_CPLUSPLUS_API */
937
938 #endif // _SIMPLETZ