how did my laptop lose daylight savings time on power loss?

Posted by EndangeringSpecies on Super User See other posts from Super User or by EndangeringSpecies
Published on 2012-04-02T16:43:53Z Indexed on 2012/04/02 17:33 UTC
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Windows

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power-supply

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clock

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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