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Zeller's Algorithm

Zeller's Algorithm can be used to determine the day of the week for any date in the past, present or future. Actually the algorithm should work only for those dates starting with the use of the Gregorian Calendar in the year 1582. The Gregorian Calendar will be off one full day in the year 4902, so this algorithm works for any dates between 1582 and 4902.

To use this algorithm, input your date of birth, press "ok" and then tada the day of the week in which you were born on appears.

Zeller's Algorithm


Year: e.g. 1970

November 1, 1970

Your were born on a