Date & Time Tools
Day of the Week Calculator
Find the weekday for any date.
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About the Day of the Week Calculator
Pick any date — past or future — and the calculator tells you the day of the week it falls on, its day-of-the-year number, and whether it's a weekend. It's handy for planning events, checking a birthday's weekday, or settling a 'what day was it?' question in seconds.
How to use the Day of the Week Calculator
- 01Enter your a date.
- 02Read the result instantly — it recalculates as you type.
- 03Adjust the numbers to model different scenarios.
Frequently asked questions
What day of the week was I born?
Enter your birth date and the calculator shows the weekday instantly, along with the day of the year.
How is the weekday determined?
From the calendar date using the Gregorian calendar rules your device follows — accurate for any modern date.