os.time() and timezones

[Rena <hyperhacker@...>]

It looks like in 5.1, os.date() can be told to give times in GMT, but
os.time(), given a table, always returns the result in the local
timezone. It also appears there's no easy way to check what the
current timezone offset is. (The best I can see would be some magic
involving os.date('%z') which then also has to be corrected for DST.
Ouch.) Does Lua provide a way to turn a table into a Unix timestamp
under the assumption that the table specifies GMT, not the local
timezone?

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