Panasonic LQ-D100P Operating Instructions Manual page 24

Preparations
4. Setting the clock
This unit automatically records the date and time at
the same time as it records frames.
The date and time information are extremely important
when it comes to managing the frames, and it is also
required when searches are conducted.
Since the clock is set at the factory, it does not
normally need to set by the user.
However, when the clock battery has been replaced
or the setting has deviated from the correct time, set
the clock using the setup menu.
For further details, refer to the setup menu items.
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