Komatsu PC220LC -8 Operation & Maintenance Manual page 119

DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES
2. Select "Clock Adjustment" on the user menu, then press switch
F6. The screen switches to the time adjustment selection
menu screen.
The following three items can be changed.
(a) Clock setting
(b) 12/24 hour display mode
(c) Daylight saving time
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OPERATION OPERATION