Turn adding machine on. press reset button on back with pointy object. press the button picturing a calendar/clock. this will bring up the date. press & hold the "time set" button (same as M+/-) enter date on number pad. press time set to save. repeat for time
Just press on the calendar / time button, then when the date comes up, press the Time Set button until the first digit blinks, and that is as far as i have gotten
Try a search with your model name and 'set date and time' in the FixYa search window. You'll get this link.
If you can't set the date even after following the instructions, try using a paperclip end to press the reset button. On this model (P23-DH V), you'll find it on the back of the unit above what appears to be a backup battery compartment.
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