Day of the Week Calculator

Find out what day of the week any date falls on — past, present, or future.

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Fill in your values above and click Calculate.

Frequently Asked Questions

Q.How do you calculate the day of the week?

The Zeller's congruence or Tomohiko Sakamoto's algorithm can compute the day of the week for any Gregorian calendar date.

Q.What day of the week was January 1, 2000?

Saturday. You can verify with this calculator by entering 2000-01-01.