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71 lines
1.9 KiB
Python
71 lines
1.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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This module offers general convenience and utility functions for dealing with
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datetimes.
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.. versionadded:: 2.7.0
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"""
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from __future__ import unicode_literals
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from datetime import datetime, time
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def today(tzinfo=None):
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"""
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Returns a :py:class:`datetime` representing the current day at midnight
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:param tzinfo:
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The time zone to attach (also used to determine the current day).
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:return:
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A :py:class:`datetime.datetime` object representing the current day
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at midnight.
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"""
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dt = datetime.now(tzinfo)
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return datetime.combine(dt.date(), time(0, tzinfo=tzinfo))
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def default_tzinfo(dt, tzinfo):
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"""
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Sets the the ``tzinfo`` parameter on naive datetimes only
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This is useful for example when you are provided a datetime that may have
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either an implicit or explicit time zone, such as when parsing a time zone
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string.
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.. doctest::
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>>> from dateutil.tz import tzoffset
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>>> from dateutil.parser import parse
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>>> from dateutil.utils import default_tzinfo
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>>> dflt_tz = tzoffset("EST", -18000)
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>>> print(default_tzinfo(parse('2014-01-01 12:30 UTC'), dflt_tz))
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2014-01-01 12:30:00+00:00
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>>> print(default_tzinfo(parse('2014-01-01 12:30'), dflt_tz))
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2014-01-01 12:30:00-05:00
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:param dt:
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The datetime on which to replace the time zone
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:param tzinfo:
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The :py:class:`datetime.tzinfo` subclass instance to assign to
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``dt`` if (and only if) it is naive.
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:return:
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Returns an aware :py:class:`datetime.datetime`.
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"""
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if dt.tzinfo is not None:
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return dt
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else:
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return dt.replace(tzinfo=tzinfo)
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def within_delta(dt1, dt2, delta):
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"""
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Useful for comparing two datetimes that may a negilible difference
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to be considered equal.
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"""
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delta = abs(delta)
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difference = dt1 - dt2
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return -delta <= difference <= delta
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