Code source de pywws.TimeZone

#!/usr/bin/env python

# pywws - Python software for USB Wireless Weather Stations
# http://github.com/jim-easterbrook/pywws
# Copyright (C) 2008-13  Jim Easterbrook  jim@jim-easterbrook.me.uk

# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

"""Provide a couple of datetime.tzinfo() objects representing local
time and UTC.

Copied directly from the datetime module documentation."""

from datetime import tzinfo, timedelta, datetime
import time as _time

ZERO = timedelta(0)
HOUR = timedelta(hours=1)

[docs]class UTC(tzinfo): """UTC"""
[docs] def utcoffset(self, dt): return ZERO
[docs] def tzname(self, dt): return "UTC"
[docs] def dst(self, dt): return ZERO
utc = UTC() STDOFFSET = timedelta(seconds = -_time.timezone) if _time.daylight: DSTOFFSET = timedelta(seconds = -_time.altzone) else: DSTOFFSET = STDOFFSET DSTDIFF = DSTOFFSET - STDOFFSET
[docs]class LocalTimezone(tzinfo): """Local time"""
[docs] def utcoffset(self, dt): if self._isdst(dt): return DSTOFFSET else: return STDOFFSET
[docs] def dst(self, dt): if self._isdst(dt): return DSTDIFF else: return ZERO
[docs] def tzname(self, dt): return _time.tzname[self._isdst(dt)]
def _isdst(self, dt): tt = (dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second, dt.weekday(), 0, -1) stamp = _time.mktime(tt) tt = _time.localtime(stamp) return tt.tm_isdst > 0
Local = LocalTimezone()