What does the Day of the Week Calculator work out?

Which weekday any date falls on. It is one of the Everyday & Tech tools on Mondo Knows.

How is the Day of the Week Calculator calculated?

You get an instant answer with the working shown underneath.

Do I need to sign up, and is my data stored?

No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo Knows Tools

Day of the Week Calculator

Which weekday any date falls on. Use the free day of the week calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.

Date

Mondo says

Choose a date.

Day of the Week Calculator: common questions

What does the Day of the Week Calculator work out?: Which weekday any date falls on. It is one of the Everyday & Tech tools on Mondo Knows.
How is the Day of the Week Calculator calculated?: You get an instant answer with the working shown underneath.
Do I need to sign up, and is my data stored?: No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

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Facts that connect to the day of the week calculator

Short, sourced facts that point back to this tool.

Venus rotates backwards relative to most solar system planetsOn Venus the Sun rises in the west and sets in the east The seven-day week traces back to ancient Babylonian lunar trackingQuarterly moon phases inspired the ancient seven-day weekly calendar cycle

Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.