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.

-- 
livecd clock is (inevitably) wrong
https://bugs.launchpad.net/bugs/105519
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