mirror of
https://github.com/psycopg/psycopg2.git
synced 2024-11-30 04:33:45 +03:00
101 lines
2.9 KiB
Python
101 lines
2.9 KiB
Python
"""tzinfo implementations for psycopg2
|
|
|
|
This module holds two different tzinfo implementations that can be used as
|
|
the 'tzinfo' argument to datetime constructors, directly passed to psycopg
|
|
functions or used to set the .tzinfo_factory attribute in cursors.
|
|
"""
|
|
# psycopg/tz.py - tzinfo implementation
|
|
#
|
|
# Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>
|
|
#
|
|
# 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, 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 MERCHANTIBILITY
|
|
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
# for more details.
|
|
|
|
import datetime
|
|
import time
|
|
|
|
|
|
ZERO = datetime.timedelta(0)
|
|
|
|
class FixedOffsetTimezone(datetime.tzinfo):
|
|
"""Fixed offset in minutes east from UTC.
|
|
|
|
This is exactly the implementation found in Python 2.3.x documentation,
|
|
with a small change to the __init__ method to allow for pickling and a
|
|
default name in the form 'sHH:MM' ('s' is the sign.)
|
|
"""
|
|
_name = None
|
|
_offset = ZERO
|
|
|
|
def __init__(self, offset=None, name=None):
|
|
if offset is not None:
|
|
self._offset = datetime.timedelta(minutes = offset)
|
|
if name is not None:
|
|
self._name = name
|
|
|
|
def utcoffset(self, dt):
|
|
return self._offset
|
|
|
|
def tzname(self, dt):
|
|
if self._name is not None:
|
|
return self._name
|
|
else:
|
|
seconds = self._offset.seconds + self._offset.days * 86400
|
|
hours, seconds = divmod(seconds, 3600)
|
|
minutes = seconds/60
|
|
if minutes:
|
|
return "%+03d:%d" % (hours, minutes)
|
|
else:
|
|
return "%+03d" % hours
|
|
|
|
def dst(self, dt):
|
|
return ZERO
|
|
|
|
|
|
STDOFFSET = datetime.timedelta(seconds = -time.timezone)
|
|
if time.daylight:
|
|
DSTOFFSET = datetime.timedelta(seconds = -time.altzone)
|
|
else:
|
|
DSTOFFSET = STDOFFSET
|
|
DSTDIFF = DSTOFFSET - STDOFFSET
|
|
|
|
class LocalTimezone(datetime.tzinfo):
|
|
"""Platform idea of local timezone.
|
|
|
|
This is the exact implementation from the Pyhton 2.3 documentation.
|
|
"""
|
|
|
|
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()
|
|
|
|
# TODO: pre-generate some interesting time zones?
|