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datelib.py
79 lines | 2.4 KiB | text/x-python | PythonLexer
# -*- coding: utf-8 -*-
# Copyright (C) 2010-2016 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# 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 Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/
"""
Provides utilities around date and time handling
"""
import datetime
import time
def makedate():
lt = time.localtime()
if lt[8] == 1 and time.daylight:
tz = time.altzone
else:
tz = time.timezone
return time.mktime(lt), tz
def utcdate_fromtimestamp(unixts, tzoffset=0):
"""
Makes a local datetime object out of unix timestamp
:param unixts:
:param tzoffset:
"""
return datetime.datetime.utcfromtimestamp(float(unixts))
def date_astimestamp(value):
"""
Convert a given `datetime.datetime` into a `float` like `time.time`
"""
return time.mktime(value.timetuple()) + value.microsecond / 1E6
def date_to_timestamp_plus_offset(value):
"""
Convert a given `datetime.datetime` into a unix timestamp and offset.
"""
# TODO: johbo: The time handling looks quite fragile here since we mix
# system time zones with naive datetime instances.
if value is None:
value = time.time()
elif isinstance(value, datetime.datetime):
assert not is_aware(value), (
"This code is not prepared to handle aware datetime instances")
value = date_astimestamp(value)
return (value, time.timezone)
def is_aware(value):
"""
Determines if a given datetime.time is aware.
The logic is described in Python's docs:
http://docs.python.org/library/datetime.html#datetime.tzinfo
"""
return (value.tzinfo is not None
and value.tzinfo.utcoffset(value) is not None)