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time_functions.py
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time_functions.py
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"""Functions for manipulating datetimes and time zones."""
# Copyright (c) 2017 Bonnie Schulkin
# This file is part of My Heavens.
# My Heavens is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
# My Heavens 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 Affero General Public License
# for more details.
# You should have received a copy of the GNU Affero General Public License
# along with My Heavens. If not, see <http://www.gnu.org/licenses/>.
from datetime import datetime
import pytz
def to_utc(tz, dtime):
"""takes a timezone-aware datetime object, and returns a utc datetime object
from http://stackoverflow.com/questions/1357711/pytz-utc-conversion
This is more complete than dtime.astimezone(pytz.utc), since it deals with
daylight savings, etc.
"""
return tz.normalize(tz.localize(dtime)).astimezone(pytz.utc)