🗓️ Day of the Week Calculator
Was 29 September 2026 a Tuesday? What weekday is your birthday next year? Enter any date and this calculator names its weekday instantly.
Handy for planning events, checking historical dates and settling friendly arguments about what day something happened.
How to use this calculator
Pick any date with the date picker. The calculator instantly names the weekday that date falls on.
- Choose the Date with the picker.
- Read the weekday name instantly.
- Change the date to check any other day.
- Use it to verify birthdays, anniversaries or deadlines.
Frequently asked questions
What does the Day of the Week Calculator compute?
It takes any calendar date you pick and returns the weekday name, from Sunday through Saturday.
Can you give a worked example?
29 September 2026 falls on a Tuesday.
How far back or forward can it go?
It uses the Gregorian calendar arithmetic built into the browser, which covers centuries in both directions, including leap years. Very old dates before the Gregorian reform may not match historical local calendars.
What is it useful for?
Checking what weekday a birthday, anniversary or deadline falls on, planning events, and verifying dates in old records or stories.