Day of Week Calculator
Find the weekday for any Gregorian date — plan anniversaries, verify old records, settle bets. Check what day you were born in seconds — free, no signup, runs locally.
How to Use the Day of Week Calculator
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Frequently Asked Questions
What weekday was I born on?
Enter your birth date: someone born 15 August 1995 gets Tuesday instantly. Works for any Gregorian calendar date, past or future — planning a 10th anniversary lands on the exact weekday.
How far back do dates work?
Any Gregorian date the input accepts, centuries back or forward. Pre-1582 dates predate Gregorian adoption in most countries, so treat very old results as proleptic (mathematical extension).
Can I find all Fridays the 13th in a year?
Enter the 13th of each month one by one — a year holds one to three Friday the 13ths. Checking all twelve takes under a minute.
Is anything uploaded when checking dates?
No — the calculation runs entirely in your browser. No dates leave your device and no account is needed.
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Last updated October 2026