Intel CH-486-33A User Manual page 19

Note: Daylight Saving
The RTC has a built-in capability to automatically adjust the
time on the two daylight savings days of the year (*). If this is
desired, set the field to "Enable".
Otherwise, set field to "Disabled". Note that in general, nothing
will be immediately observable by setting the field to either
state.
Daylight Savings.. ..... Disable
first reaches 1:59:59 am, it is rdled-barck to 1:OO:OO am
BIOS SETUP
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