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Day of the Week Calculator

Adjust the inputs below. Results update as you type.

How it works

Uses the Tomohiko Sakamoto or Zeller's congruence algorithm to compute the day of the week for any Gregorian date. Julian calendar dates before October 15, 1582 follow different rules. Useful for historical research, event planning, and curiosity about birthdays or anniversaries. The Gregorian calendar was adopted at different times in different countries.

Wednesday

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