Panasonic HX-WA03W - Manual (Page 41)

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≥ At the time of purchase, the [CLOCK SET] is not set.
≥ If the [CLOCK SET] have not been set or the built-in clock battery has
run down, the screen display and recording time information will
appear as follows.
Recording screen display: --- -- ---- --:----
Recording time information: JAN 01 2013 12:00AM
≥ To charge the built-in clock battery, install a fully charged battery in the
unit. If you leave the battery for approximately 24 hours, the time
settings will be stored for approximately 7 days. (The charging
continues even when the unit is turned off)