Holux GM-120 - Manual (Page 73)

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Setting the Time
The local time can be set on the GM-120 using the Time setting function.
Local time is set by entering the offset from Greenwich mean time. For
instance, if local time is 7 hours ahead of Greenwich mean time, you will
need to enter an offset of plus (+) seven hours.
To change the Time setting:
1. Press the Menu button twice to display the main
menu.
2. Select Sys. Settings and press OK.
3. Use the left/right navigation keys to select the
Time tab.
4. Use the up/down navigation keys to select the
Adjust Time field.
5. Press OK to toggle between Plus and Minus.
6. Use the up/down navigation keys to highlight the Hour field and
press OK.
7. Use the up/down navigation keys to change the Hour field and
press OK to confirm your setting. The Current Time field shows
the corrected time.
8. In the Minute field, press OK to toggle between 0 and 30.
9. Use the up/down navigation keys to highlight √ and press OK to
confirm the time setting.