Nikon Coolpix 100 - Manual (Page 26)

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To adjust the time or date, first make sure that the camera is turned off. Then
turn the camera on while pressing the QUALITY button.
QUALITY
After the camera has finished its initial check, the first two digits of the date/
time display will flash.
Press the QUALITY button until the item you want to change begins to flash.
Pressing the ADJUST button changes the value of the selected item.
Pressing the ADJUST button once will increase the value of the selected item
by one; holding the button down will cause the value to increase rapidly.
When the maximum value is reached, pressing ADJUST will return the item
its lowest value.
First Steps : Setting the Time and Date