fix: remove unsupported named time zones

[yuankunzhang]

Closes #196.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (46a5ef8) to head (fa90303).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #198   +/-   ##
===========================
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[cakebaker]

Thanks!