Q: "What time zones can be set when loading users through the API?"

 

A: I've got scads of them here: http://tinyurl.com/TimeZoneSidKey. Remember that time offsets vary throughout the year; for one prominent example, wacky North Americans start Daylight Saving Time three weeks before their sober European counterparts.

 

 

Gotta love XKCD. And gotta gotta love UNIXKCD.