Convert UTC offset to USA time zone with Joda Time

If you only have an offset, then no, you can't. -5 could be Central Daylight Time or Eastern Standard Time, for example. Likewise an offset of -7 could be Pacific Daylight Time or Mountain Standard Time.

If you have an offset and a date/time at which it was valid, you could make a pretty good guess - but only if you assume that everywhere in the US switches to daylight saving, and that everywhere does it at the same time - but that's not entirely the case.