Day of the Week Calculator – Find Any Date's Weekday
Find out what day of the week any date falls on.
About the Day of the Week Calculator
What is the Day of the Week Calculator?
A day of the week calculator tells you which weekday — Monday through Sunday — any given date falls on.
Why use this calculator?
It is useful for checking historical dates, planning recurring events and satisfying curiosity about birthdays and anniversaries.
How to use it
- Enter any date.
- Read the weekday name.
Formula
The calculator reads the calendar day directly, so it is always exact.
It works for any valid Gregorian date, past or future.
Frequently Asked Questions
What day was 1 January 2000?
It was a Saturday.
Can it handle dates far in the past?
Yes, as long as the browser can represent the date, which comfortably covers several centuries around today.
Does it account for leap years?
Yes. The date logic follows the Gregorian calendar, including leap years and differing month lengths.
Are weekends and holidays excluded?
Only if the calculator says so. By default, results count every calendar day; use a business-day option where available.
Which time zone is used?
Calculations use whole calendar dates and are time-zone independent unless a time-of-day is involved.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.