We don't support the use of "PST" or other abbreviations when parsing timezone values. This requires access to more tzinfo fields than are readily available in the time package to resolve a candidate timezone.

If this is implemented, look at:

• https://github.com/postgres/postgres/tree/REL_10_5/src/timezone
• https://github.com/postgres/postgres/blob/REL_10_5/src/timezone/localtime.c#L1706