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from __future__ import division from datetime import timedelta, tzinfo from copy import deepcopy class FixedOffset(tzinfo): ''' Represent a timezone with a fixed offset from UTC and no adjustment for DST. >>> FixedOffset(4,0) <UTC+04:00> >>> FixedOffset(-4,0) <UTC-04:00> >>> FixedOffset(4,30) <UTC+04:30> >>> tz = FixedOffset(-5,0) >>> tz.dst(None) datetime.timedelta(0) The class tries to do the right thing with the sign of the time zone offset: >>> FixedOffset(-9,30) <UTC-09:30> >>> FixedOffset(-9,-30) Traceback (most recent call last): ... ValueError: minutes must not be negative Offsets must thus be normalized so that the minute value is positive: >>> FixedOffset(-8,30) <UTC-08:30> ''' def __init__(self, hours, minutes): ''' Create a new FixedOffset instance with the given offset. ''' tzinfo.__init__(self) if minutes < 0: raise ValueError("minutes must not be negative") if hours < 0: minutes *= -1 self.__offset = timedelta(hours=hours, minutes=minutes) self.__name = "UTC" + timezone(timedelta_seconds(self.__offset)) def dst(self, dt): ''' Return offset for DST. Always returns timedelta(0). ''' return timedelta(0) def utcoffset(self, dt): ''' Return offset from UTC. ''' return self.__offset def tzname(self, dt): ''' Return name of timezone. ''' return self.__name def __repr__(self): return "<{0}>".format(self.tzname(None)) def __deepcopy__(self, memo): cls = self.__class__ result = cls.__new__(cls) memo[id(self)] = result for k, v in self.__dict__.items(): setattr(result, k, deepcopy(v, memo)) return result def timedelta_seconds(td): ''' Return the offset stored by a :class:`datetime.timedelta` object as an integer number of seconds. Microseconds, if present, are rounded to the nearest second. Delegates to :meth:`timedelta.total_seconds() <datetime.timedelta.total_seconds()>` if available. >>> timedelta_seconds(timedelta(hours=1)) 3600 >>> timedelta_seconds(timedelta(hours=-1)) -3600 >>> timedelta_seconds(timedelta(hours=1, minutes=30)) 5400 >>> timedelta_seconds(timedelta(hours=1, minutes=30, ... microseconds=300000)) 5400 >>> timedelta_seconds(timedelta(hours=1, minutes=30, ... microseconds=900000)) 5401 ''' try: return int(round(td.total_seconds())) except AttributeError: days = td.days seconds = td.seconds microseconds = td.microseconds return int(round((days * 86400) + seconds + (microseconds / 1000000))) def timezone(utcoffset): ''' Return a string representing the timezone offset. Remaining seconds are rounded to the nearest minute. >>> timezone(3600) '+01:00' >>> timezone(5400) '+01:30' >>> timezone(-28800) '-08:00' ''' hours, seconds = divmod(abs(utcoffset), 3600) minutes = round(float(seconds) / 60) if utcoffset >= 0: sign = '+' else: sign = '-' return '{0}{1:02d}:{2:02d}'.format(sign, int(hours), int(minutes))