Tools / Day of the week calculator
Day of the week calculator
Pick a date – e.g. your birthday or a deadline – and see the weekday, calendar week and how many days away it is.
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Choose a date.
- Read the weekday.
- Calendar week, day of the year and distance from today are shown too.
Your inputs live only in the link, not on our server.
Last checked: October 2026 · Based on: Gregorian calendar; ISO 8601 week numbering. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
On which weekday was I born?
Enter your date of birth – the calculator shows the weekday instantly.
How are calendar weeks counted?
By ISO 8601: weeks start on Monday and week 1 is the week with the first Thursday of the year.
Is 2028 a leap year?
Yes – years divisible by 4 are leap years, except century years not divisible by 400.