Nikon V3 - Manual (Page 56)

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A The Camera Clock
The camera clock is less accurate than most watches and household
clocks. Check the clock regularly against more accurate time pieces
and reset as necessary.
The camera clock is powered by an independent, rechargeable
power source, which is charged as necessary when the main battery
is installed or the camera is powered by an optional power connec-
tor and AC adapter (
0 222). Three days of charging will power the
clock for about a month. If a message warning that the clock is not
set is displayed when the camera is turned on, the clock battery is
exhausted and the clock has been reset. Set the clock to the correct
time and date.