| # This Source Code Form is subject to the terms of the Mozilla Public |
| # License, v. 2.0. If a copy of the MPL was not distributed with this |
| # file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| |
| """Module for providing specific timezones""" |
| |
| from datetime import datetime, timedelta, tzinfo |
| |
| |
| class PacificTimezone(tzinfo): |
| """Class to set the timezone to PST/PDT and automatically adjusts |
| for daylight saving. |
| """ |
| |
| def utcoffset(self, dt): |
| return timedelta(hours=-8) + self.dst(dt) |
| |
| |
| def tzname(self, dt): |
| return "Pacific" |
| |
| |
| def dst(self, dt): |
| # Daylight saving starts on the second Sunday of March at 2AM standard |
| dst_start_date = self.first_sunday(dt.year, 3) + timedelta(days=7) \ |
| + timedelta(hours=2) |
| # Daylight saving ends on the first Sunday of November at 2AM standard |
| dst_end_date = self.first_sunday(dt.year, 11) + timedelta(hours=2) |
| |
| if dst_start_date <= dt.replace(tzinfo=None) < dst_end_date: |
| return timedelta(hours=1) |
| else: |
| return timedelta(0) |
| |
| |
| def first_sunday(self, year, month): |
| date = datetime(year, month, 1, 0) |
| days_until_sunday = 6 - date.weekday() |
| |
| return date + timedelta(days=days_until_sunday) |
