Canon P170-DH Calculator

Here is a manual for the unit maybe there is a way to reset the unit.
Canon P170 DH Printing Calculator Manual

See the instructions at the beginning of this manual: http://downloads.canon.com/cpr/software/calculator/P170-DH-(USA-HWB).pdf

It's the first thing in the manual.

You can download the manual from the manufacturer's web site at
http://www.usa.canon.com/cusa/support/office/calculators/desktop_printing/p170_dh#BrochuresAndManuals

You can download the manual from the manufacturer's web site at
http://www.usa.canon.com/cusa/support/office/calculators/desktop_printing/p170_dh#BrochuresAndManuals

Press the Date and Time button on the calculator. It is to the right of the Feed button and has a small calendar and clock on it. To set the date, press the button once to display the factory supplied date and hold down the Equal ( = ) button that is two buttons below Date and Time until the screen flashes. Input the correct date. Ex: August 20, 2010 would be entered on the numerical keyboard of the calculator at 08202010. When finished, hold the Equal button again. Do the same for the time.

To sum it up:

Press Date and Time button
Hold = button until blinks
Enter date or time
Hold = button again until blinking stops

Press the button to the right of the FEED button twice. The first time you press it will be for the Date, the second will bring up the time.

I continued doing some online research on the question and found the solution. Thanks.

1. Press the calendar/clock button twice
2. Press and hold the Clock/Date Set (or Time Set) button for three seconds.
3. Use the numeric keys to enter the time -- four digits (i.e., 0730)
4. Press the AM/PM button to select
5. Press the Clock/Date Set (or Time Set) button
6. Press the C/CE button to return to calculation mode

Download the P170-DH Calculator Instruction Manual and folow the instructions.

for calandar
turn on.
press clock calandar button, top row second from left.
press time set button, second row from left, 3rd button from top, (has time set printed diretly above)
enter numbers, say 03 05 2009
press time set button 3 seconds
press CE/E, red key at bottom left corner.

turn on
press clock calandar button once, date will show
press clock calandar button 2nd time, clock will show
press time set once
enter time
press am/pm button (below time set)
press time set for 3 seconds
press CE/E red button to return to calculation mode

thats it