The CMOS battery on the motherboard is weak and must be replaced.

Reboot the computer, enter the BIOS setup program, write down all the settings on
each available screen.
You then need to replace the CMOS battery on the motherboard, after which the BIOS
settings must be reset.

CH000239: Losing time and or replacing the CMOS battery.:
http://www.computerhope.com/issues/ch000239.htm
Scroll down to the "Bad Battery / Replacing the CMOS battery" heading.
--
Glen Ventura, MS MVP W95/98 Systems
http://dts-l.org/goodpost.htm


wrote in message
...
When computer is on, exact time and date and displayed.
Shut down computer and turn on later, maybe next day,
time and date is way off.