Instantly find out what day of the week any date falls on, whether in the past or the future.
This tool instantly determines which day of the week any date falls on, using standard calendar calculations.
The tool uses the built-in JavaScript Date object, which correctly accounts for leap years and calendar rules across the Gregorian calendar.
Select any date, past or future, and click Calculate to instantly see which day of the week it falls on.
Example: January 1, 2000 fell on a Saturday, while January 1, 2026 falls on a Thursday.
How far back or forward does this work. The JavaScript Date object supports a very wide range of years, covering virtually any practical historical or future date.
Why is this useful. It helps with scheduling, verifying historical dates, and planning events on specific weekdays.