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Day of the Week Calculator
Find out which day of the week any date falls on, past or future. Great for birthdays, historical dates and planning.
About the Day of the Week Calculator
Find out which day of the week any date falls on, past or future. Great for birthdays, historical dates and planning.
How to use the Day of the Week Calculator
- Select a date under Select a Date.
- Press Find the Day to see the weekday.
Formula and method
The weekday is worked out from the Gregorian calendar by counting the days since a known reference date and taking the remainder when divided by 7.
Worked example
4 July 1776 was a Thursday. 1 January 2000 was a Saturday.
When to use the Day of the Week Calculator
- Finding out which weekday a date fell on or will fall on.
- Checking the day you were born.
- Planning events on a specific date in the future.
Common mistakes to avoid
- Typing the date in the wrong order, such as day and month reversed.
Tips
- Dates before the Gregorian calendar was adopted (1582 in some countries, later in others) may differ from historical records.
Frequently asked questions
What day of the week was I born?
Enter your date of birth to see the weekday.
Does it work for very old dates?
It uses the Gregorian calendar, which is used from the 1500s onward. Dates before that may differ from historical records.