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it was an old laptop that may or may not have dead CMOS battery (at least it had time reset to 0 when I dusted it off). So, it was plugged into power for awhile without the main battery and the clock was correct. Then there was a power outage. When I subsequently turned it on, surprise-surprise, it had one hour off correct time. So the clock apparently kept running during the outage, but daylight savings time info vanished (from disk? where is it stored?)

How come?

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All sorts of odd things happen when the system loses power unexpectedly. At a guess, the computer hadn't gotten around to updating the hardware clock time when the power was lost. –  Harry Johnston Apr 2 '12 at 21:48

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So the clock apparently kept running during the outage, but daylight savings time info vanished (from disk? where is it stored?)

Registry, Just enable it and adjust the clock.

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