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On the back, select the year and month, Note the key that is displayed: a letter and a special character (example: A^). Flip it over to the front. Select the letter and then select the special character. The letter indicates the starting day of the week and the special character basically masks off the right number of days from the end of the month. Let me know if you need more help.
This is a better version of my design. I have redesigned mine so that it is one sided (doesn't have to be flipped over). I would like to laser cut it on wood. This design would be very nice laser cut also. Good job!