Day of the Week Calculator
Find the day of the week for any date — past or future — plus the day of the year, ISO week number, quarter, whether it’s a leap year and how far it is from today. See the same date’s weekday in other years too.
This tool runs entirely in your browser.
How to use the Day of the Week Calculator
- 1Pick a date — today is filled in to start.
- 2Read the weekday and the details below it.
- 3Check the table to see which weekday the same date falls on in other years.
What is the Day of the Week Calculator?
The weekday of a date shifts by one each year (365 days is 52 weeks plus 1 day) and by two after 29 February in a leap year — that is why your birthday moves through the week. Leap years are divisible by 4, except century years not divisible by 400: 2000 was a leap year, 1900 was not.
Dates use the Gregorian calendar throughout, the standard in most countries today. For historical dates before a country switched from the Julian calendar (1582 in much of Europe, 1752 in Britain), contemporary records may name a different weekday.
Frequently asked questions
What day of the week was 1 January 2000?
A Saturday.
What happens to 29 February birthdays?
In non-leap years the date doesn’t exist; the table marks those years instead of guessing between 28 February and 1 March.
Is the Day of the Week Calculator free and private?
Yes. The Day of the Week Calculator is free, needs no account, and runs entirely in your browser. What you type is never sent to a server or stored.
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