How to use longer timezone names in parsing references?

[LJNeon]

I have a database containing longer timezone names (e.g. "America/Los_Angeles" or "Asia/Singapore") and want to use them in parsing references. But simply using them as-is doesn't work, looking at src/timezone.ts it appears that only shorter timezone names (e.g. "CT" or "SGT") work.

Would it be possible to add support for longer timezone names as well, or am I missing something that allows me to easily do this?