> I think Ruby should not include timezone database because
> its maintainance.

AFAIK, there are a plans to distribute ruby core libraries as a gems.
So, tz database can be packed as a gem, so it can be updated
immediately after new version.
> However it may be considerable to extend Time to hold arbitrary time
> offset from UTC, as DateTime:
This is partial solution, it doesn't solve main problem, but it is of
course better then current situation.
--
Pavel