BUG/TST: Add more timezone fixtures and use is_utc more consistently by mroeschke · Pull Request #23807 · pandas-dev/pandas (original) (raw)

• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

Was discussed a while back with @jreback to add more timezones to the tz_aware_fixture, added some less tested ones like:

• dateutil.tz.tzlocal
• pytz.FixedOffset

This uncovered some bugs with tzlocal especially near DST transitions.

Additionally, using is_utc more consistently for UTC checking across the codebase and no longer passing the string 'UTC' around. Instead the UTC timezone object (i.e. pytz.UTC or dateutil.tz.tzutc()) is passed along. However, for single value conversion to/from UTC, pytz.UTC is used by default.