Day of the Week Calculator
Find out which day of the week any date falls on — past or future. Great for birthdays, history and planning.
Calendar: proleptic Gregorian. Dates before 1582 are calculated by extending modern rules backward, not by reproducing local historical calendars.
Leap year rules? Leap year checker · days between: Date difference · monthly view: Monthly calendar.
How to use
Pick any date and the tool tells you what day of the week it is, plus day-of-year, ISO week number, and the next five matching weekdays.
FAQ
What does it tell me?
It shows which day of the week any date falls on, for dates in the past or the future.
What can I use it for?
Finding the weekday you were born, planning events, or settling history and trivia questions.
Does it use my calendar?
It uses the proleptic Gregorian calendar. Dates before 1582 extend modern Gregorian rules backward and may not match the calendar used locally at the time.
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