why does Vista desktop calendar have the wrong date?

I added the calendar to my father's Vista desktop side bar. It was at 6pm EST on Nov. 8th but the calendar said Nov. 9th. I double clicked on the calendar and changed it to the 8th. I think I had to reboot for some reason and again it said the 9th. The clock on the side bar and lower right part of the screen were accurate. It couldn't be daylight savings times since the difference there is only an hour. The only thing I can think of is leap year involved some how but that is Feb. not Nov.
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nickg5Asked:
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KnightsmanCommented:
Might be the Bios Date being wrong?

found a fix
http://support.microsoft.com/kb/943544
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nickg5Author Commented:
I'll check it out the next time I'm over at his house which may be a few days.
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Windows Vista

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