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Day of the week finder

Pick a date to see its weekday, day-of-year, ISO week number and more.

How Day of the week works

Day of the week answers one question, instantly: what weekday does a given date fall on? Type any date, past, present or future, and get the weekday name, along with the day of the year and the ISO week number for quick context.

This is the focused tool to use when the weekday is all you need (planning a recurring meeting, checking a historical date, settling a bet). For a fuller breakdown of a date, quarter, leap year, zodiac, use Date details instead. It uses the proleptic Gregorian calendar, so it returns a consistent weekday for any year, centuries back or forward.

Frequently asked questions

I want more than the weekday, which tool should I use?

Use Date details for the complete picture (week number, quarter, leap year, zodiac and more). Day of the week stays deliberately minimal so you get the weekday with zero clutter.

Does it work for any year, including far in the past or future?

Yes. It uses the proleptic Gregorian calendar, so it returns a consistent weekday for any year your browser can represent, centuries back or forward.

Is the date I enter sent anywhere?

No. Every value is computed in your browser, on your device. The date you enter never leaves your machine and nothing is stored between visits.

Does it work offline?

Yes, once the page has loaded. Because the processing happens on your device, you can disconnect from the network and the tool keeps working. This is the clearest proof that your data never leaves your machine.

Is it free? Do I need an account?

It is completely free and requires no sign-up. There are no watermarks, no daily limits and no tracking cookies needed to use the tool.