Day of the Week Calculator
What day of the week is, was or will be any date?
Day of the week
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- Add or Subtract Days
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Questions
- What day of the week was I born?
- Enter your date of birth and the calculator shows the weekday, for example "Tuesday". It works for any date from year 1 onward in the Gregorian calendar.
- What is the week number?
- Week numbers follow ISO 8601: weeks start on Monday, and week 1 is the week that contains the year’s first Thursday.
- How does the calculator work out the weekday?
- It counts the exact number of days from a known date, so leap years and the varying month lengths are all accounted for.