i have changed the date and time but not changed the cmos battery why isint itstill works?

The pc has some problems with security certificate error and can't fix it only I just changed the date and time!
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More about changed date time changed cmos battery isint itstill works
  1. CMOS battery has probably died and needs replacing.
    Changing date/time manually only keeps time until you turn off the computer when CMOS battery is dead.
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Battery Security CMOS Certificate Windows XP