### Navigation

- index
- modules |
- pywws 13.03_7f9fc90 documentation »
- Module code »

# Source code for 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)

    class UTC(tzinfo):
        """UTC"""
        def utcoffset(self, dt):
            return ZERO
        def tzname(self, dt):
            return "UTC"
        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

    class LocalTimezone(tzinfo):
        """Local time"""
        def utcoffset(self, dt):
            if self._isdst(dt):
                return DSTOFFSET
            else:
                return STDOFFSET
        def dst(self, dt):
            if self._isdst(dt):
                return DSTDIFF
            else:
                return ZERO
        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()

### Navigation

- index
- modules |
- pywws 13.03_7f9fc90 documentation »
- Module code »