From: John Beckett 

"Frank Haber"  wrote in message
news::
> All communication via LAN or WAN must include a GMT time and offset

No. It's much simpler than you're thinking. The whole point is that each
computer is working in UTC time. If computer A talks to computer B over a
network (with a protocol supporting these concepts, such as Kerberos), then
the two computers use UTC timestamps. So there is *no* confusion, and no
need to specify the timezone of each computer.

Any time or date is exchanged as UTC, which is how the computer internally thinks.

It's only when a timestamp is displayed to a user that there is trouble.
Also, Windows sets the BIOS clock to local time.

 Windows uses its *current* knowledge of DST and timezone rules to guess
whether an historical time should be adjusted for DST. If your laptop was
set for Sydney time zone, you would see files with a certain date/time. If
you fly to NY and change the time zone on your laptop, then the same files
will appear to have a different date/time.

John

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