Pentax OPTIO S Operating Manual page 23

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When you have finished the settings, press the OK but-
ton when the clock reaches O0 seconds.
The camera is ready to take a picture.
When you set date and time except the initial settings,
press the OK button again after pressing the OK button
when the clock reaches 0O seconds to return to capture
mode.
• When the initial settings screen is displayed, you can cancel
the settings operation and switch to Capture mode by press-
ing the MENU button. If this is done, the initial settings screen
will be displayed next time you turn the camera on.
• You can change the settings after they have been made.
Refer to "Changing the Date/Time" (p.114).