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Day of Week Calculator
Select a date to find out which day of the week it falls on.
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Frequently Asked Questions
How is the day of week calculated?
The calculation uses Zeller's congruence algorithm which determines the day of the week for any Julian or Gregorian calendar date.
Can I calculate dates in the past?
Yes! You can calculate the day of the week for any date, past or future, including dates hundreds of years ago.