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Counting days has never been this much fun! This project can be assembled by novice makers. The chip comes pre-programmed with software that allows the DayCounter to count up one day at a time, or lets the user set the count to a desired value with a simple one button interface, and have it count down one day at a time. Easily mounts in a frame or posterboard so that you can customize the surrounding text to suit your particular needs. A single DayCounter is good for up to 99 days, and they can be "chained together" serially to give you more digits.

Day Counter - How many days and/or weeks between two dates

 From:   Month Day  Year  Era
 To:       Month Day  Year  Era



  1. Enter earlier date information at "From:"
  2. Enter later date information at "To:"
  3. Select a month and a date. Enter a year.
    • The year entered must be a positive number. Not zero (0).
    • If you type "ghblxz", in the year box the computer will print "0"
    • If you type "1.9e2", the computer will use "190" to calculate the answer.
    • If you select "February 31", the computer will print "Not a Day"
  4. Click "Click to Calculate" button. The number of days between the two selected dates will appear.
    • NaN = not a number
  5. To clear the entry boxes click "Reset".
    • The calculations made on this calculator count exclusively.
    • To count inclusively, you may add one day to the results.