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