lib/kosmorrolib/dateutil.py

#!/usr/bin/env python3

#    Kosmorro - Compute The Next Ephemerides
#    Copyright (C) 2019  Jérôme Deuchnord <jerome@deuchnord.fr>
#
#    This program 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.
#
#    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 Affero 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 <https://www.gnu.org/licenses/>.

from datetime import datetime, timezone, timedelta


def translate_to_timezone(date: datetime, to_tz: int, from_tz: int = None):
    if from_tz is not None:
        source_tz = timezone(timedelta(hours=from_tz))
    else:
        source_tz = timezone.utc

    return date.replace(tzinfo=source_tz).astimezone(tz=timezone(timedelta(hours=to_tz)))