Oce OP33 Reference Manual page 144

G When setting the Daylight Saving Time Settings:
→ →
Press "Daylight Saving Time Settings" press "On" press "Start Date."
→
Select "Month" "Day" to specify each of them.
3
Enter the time using "–" and "+," and press "OK."
Press "End Date" and make the settings in the same way as the above.
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Setting the Timer (Timer Settings) 3-33