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73416ba
(Get the code!)
dhcp has a timezone option. I might not be widely used, but dhclient on the livecd should be configured to request timezone or location or whatever the option is. Then if the server does support it, you're all set.
DHCP also supports a list of NTP servers, although that's not so necessary since Ubuntu seems to have a default for that anyway. It would be much better to use people's ISP's NTP servers, though.
Many machines will have their BIOS clocks set to local time, so if you can get the difference between that and NTP time, that would be a good default for a timezone (although there are multiple timezones with the same time offset). Probably you'd have to record hwclock time, then do ntpdate, if ntpdate modifies the hwclock, too.
On machines with BIOS clock = UTC, which is good if you never boot any silly OSes that don't support that, the livecd will just default to timezone = UTC, like before.