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1 # -*- coding: utf-8 -*-
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2 """
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3 This module offers general convenience and utility functions for dealing with
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4 datetimes.
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5
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6 .. versionadded:: 2.7.0
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7 """
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8 from __future__ import unicode_literals
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9
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10 from datetime import datetime, time
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11
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12
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13 def today(tzinfo=None):
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14 """
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15 Returns a :py:class:`datetime` representing the current day at midnight
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16
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17 :param tzinfo:
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18 The time zone to attach (also used to determine the current day).
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19
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20 :return:
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21 A :py:class:`datetime.datetime` object representing the current day
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22 at midnight.
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23 """
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24
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25 dt = datetime.now(tzinfo)
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26 return datetime.combine(dt.date(), time(0, tzinfo=tzinfo))
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27
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28
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29 def default_tzinfo(dt, tzinfo):
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30 """
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31 Sets the ``tzinfo`` parameter on naive datetimes only
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32
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33 This is useful for example when you are provided a datetime that may have
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34 either an implicit or explicit time zone, such as when parsing a time zone
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35 string.
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36
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37 .. doctest::
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38
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39 >>> from dateutil.tz import tzoffset
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40 >>> from dateutil.parser import parse
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41 >>> from dateutil.utils import default_tzinfo
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42 >>> dflt_tz = tzoffset("EST", -18000)
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43 >>> print(default_tzinfo(parse('2014-01-01 12:30 UTC'), dflt_tz))
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44 2014-01-01 12:30:00+00:00
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45 >>> print(default_tzinfo(parse('2014-01-01 12:30'), dflt_tz))
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46 2014-01-01 12:30:00-05:00
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47
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48 :param dt:
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49 The datetime on which to replace the time zone
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50
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51 :param tzinfo:
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52 The :py:class:`datetime.tzinfo` subclass instance to assign to
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53 ``dt`` if (and only if) it is naive.
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54
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55 :return:
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56 Returns an aware :py:class:`datetime.datetime`.
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57 """
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58 if dt.tzinfo is not None:
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59 return dt
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60 else:
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61 return dt.replace(tzinfo=tzinfo)
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62
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63
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64 def within_delta(dt1, dt2, delta):
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65 """
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66 Useful for comparing two datetimes that may have a negligible difference
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67 to be considered equal.
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68 """
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69 delta = abs(delta)
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70 difference = dt1 - dt2
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71 return -delta <= difference <= delta
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