Day of Week

Find out which weekday any date falls on, with its day number and ISO week number.

Find the weekday

Pick a date

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Full date: —

Weekday number: — (1 = Monday, 7 = Sunday)

Day of year: — · ISO week: —

Distance from today: —

The date is read on your own device, so the answer is always private.

Pick any date with the date field, or press Today for the current date.
The weekday name, full date and day number appear straight away.
Scroll through the extra details to see the day of the year and the ISO week number.

Common questions about the free online day of week.

Pick the date in the date field. The weekday name and its number in the week appear immediately.

Days are numbered from Monday as 1 through to Sunday as 7, which is the ISO 8601 convention.

Yes. Any date your browser supports works, including dates many centuries in the past or the future.

Yes. The day of year and week number come from the real calendar, so February 29 is counted correctly.

It is the week number defined by ISO 8601, where weeks start on Monday and week 1 contains the first Thursday of the year.

It is a quick way to see how far away a date is. A negative figure means the date has already passed.

No. Everything is calculated in your browser and the date never leaves your device.

Yes, the day of week calculator is completely free with no account and no sign up.

Last updated: October 10, 2026