Casio GB-6900B User's Manual For Watch Functions page 24

Note
• Refer to the "City Name List" (back of this manual) to determine the time zone of
the city where you will be using the watch.
- Summer time, or Daylight Saving Time (DST) as it is known in some countries,
calls for setting clocks ahead one hour from standard time during the summer
season. Note that the period during which and the areas where summer time is
applied depend on each country. Some countries or geographic areas may not
use summer time.
- The DST indicator will be on the display and timekeeping will be advanced by one
hour when summer time is turned on.
- The watch's Full Auto Calendar automatically makes adjustments in the day
setting to account for different length months and leap year.
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4
. A fter.all.the.settings.are.the.way.you.want,.press.A.to.return.to.the.
Timekeeping.Mode.
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