The KX-TGA470 handset works with several models of Panasonic cordless phone base units. Press Menu and then press #. Next press 1 0 1 . (Alternatively use the arrow keys to navigate to find Initial Settings and then Set date and time after pressing Menu.) If you need to change the date, type in the date as three sets of two digit numbers (month, day and year). Then press OK. Next type in the time. Press OK and then select AM/PM with the arrow keys if you are using 12-hour time. Finally chose Save followed by Off.
The manual for the base describes setting the date and time. See
http://panasonic.ca/viewing/ALL/KX-TG4711C/OI/TG4711C_PNQX5094ZA/TG4711C_PNQX5094ZA.pdf on page 15.
I hope this helps.
Cindy Wells
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