Fixes for time zone conversions#16

Merged

lpil merged 3 commits intogleam-lang:mainfrom

Feb 5, 2025

Commits on Feb 4, 2025

initial fix for problems I saw, two test failures need to examine and add new tests
devries
committed
Fixed the tests, but need to add a couple more tests:
devries
committed
Added two tests to switch from UTC to EST (-05:00) and EST to UTC
devries
committed