pytz
pytz brings the Olson tz database into Python. This library allows accurate and cross platform timezone calculations using Python 2.4 or higher. It also solves the issue of ambiguous times at the end of daylight saving time, which you can read more about in the Python Library Reference (datetime.tzinfo).
Almost all of the Olson timezones are supported.
https://pypi.org/project/pytz/
MetPy Mondays `#133 - Timezones and pytz : Unidata Developer's Blog
https://www.unidata.ucar.edu/blogs/developer/entry/metpy-mondays-133-timezones-and