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or gains time, you can update it at a future date by the same
procedure just described: first get the Unix time right using "date"
and then use "clock -w" or "clock -u -w" to set the hardware clock.

If your hardware clock is set using local time, make sure to reset it
when daylight time changes.  If you're running Unix when daylight time
changes, the Unix time will adjust automatically.  In that case, all
you need is "clock -w" to update the hardware clock.  If you aren't
running Unix during the transition, then your time will be an hour off
the next time you boot.  In that case, set the correct Unix time using
"date", and then use "clock -w" to update the hardware clock.  If your
hardware clock is set using GMT time, none of this is necessary --
daylight time transitions will happen automatically.