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About the Day of the Week Calculator
This calculator finds the day of the week for any calendar date, past or future. Enter a date and you get the matching weekday, such as Monday or Friday. The result appears right after you submit the date.
The tool uses Zeller's Congruence, a standard formula for computing the weekday from a given day, month, and year. You only need to supply the full date in day, month, and year format. Keep in mind that dates before the Gregorian calendar was adopted in 1582 may not match historical records, since many regions then used the Julian calendar. For important historical or scheduling decisions, consider verifying the date with a professional source.
- Enter the day, month, and year in the date fields.
- Click the calculate button.
- Read the weekday shown in the result.