Pentax Optio WP Operating Manual page 158

7
Use the four-way controller (45) to select O (On) or P
(Off).
Select O (On) if the Destination city uses daylight saving time.
8
Press the 4 button twice.
The World Time setting is saved.
Select W in Step 3 to set the city and DST setting for the Hometown
city.
8
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