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Day of year
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ISO week
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Leap year
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Days left in year
Frequently Asked Questions
What day of the week was a given date?
Pick any past or future date and the calculator tells you which weekday it falls on, along with its day-of-year number, ISO week number and whether it is a leap year.
Find out which day of the week any date falls on, plus its day-of-year and ISO week number.