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95 lines
2.6 KiB
Python
95 lines
2.6 KiB
Python
# psycopg/tz.py - tzinfo implementation
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#
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# Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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import datetime
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import time
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ZERO = datetime.timedelta(0)
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class FixedOffsetTimezone(datetime.tzinfo):
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"""Fixed offset in minutes east from UTC.
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This is exactly the implementation found in Python 2.3.x documentation,
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with a small change to the __init__ method to allow for pickling and a
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default name in the form 'sHH:MM' ('s' is the sign.)
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"""
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_name = None
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_offset = ZERO
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def __init__(self, offset=None, name=None):
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if offset is not None:
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self._offset = datetime.timedelta(minutes = offset)
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if name is not None:
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self._name = name
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def utcoffset(self, dt):
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return self._offset
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def tzname(self, dt):
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if self._name is not None:
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return self._name
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else:
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seconds = self._offset.seconds + self._offset.days * 86400
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hours, seconds = divmod(seconds, 3600)
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minutes = seconds/60
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if minutes:
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return "%+03d:%d" % (hours, minutes)
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else:
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return "%+03d" % hours
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def dst(self, dt):
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return ZERO
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STDOFFSET = datetime.timedelta(seconds = -time.timezone)
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if time.daylight:
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DSTOFFSET = datetime.timedelta(seconds = -time.altzone)
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else:
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DSTOFFSET = STDOFFSET
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DSTDIFF = DSTOFFSET - STDOFFSET
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class LocalTimezone(datetime.tzinfo):
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"""Platform idea of local timezone.
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This is the exact implementation from the Pyhton 2.3 documentation.
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"""
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def utcoffset(self, dt):
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if self._isdst(dt):
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return DSTOFFSET
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else:
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return STDOFFSET
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def dst(self, dt):
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if self._isdst(dt):
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return DSTDIFF
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else:
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return ZERO
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def tzname(self, dt):
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return time.tzname[self._isdst(dt)]
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def _isdst(self, dt):
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tt = (dt.year, dt.month, dt.day,
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dt.hour, dt.minute, dt.second,
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dt.weekday(), 0, -1)
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stamp = time.mktime(tt)
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tt = time.localtime(stamp)
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return tt.tm_isdst > 0
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LOCAL = LocalTimezone()
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# TODO: pre-generate some interesting time zones?
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