Day of the Week Calculator
Find out what day of the week any date falls on.
Any date, past or future. Worked out in your browser.
Week numbers follow the international standard, where weeks start on Monday.
How to find the day of the week for a date
Enter a date
Type or pick any date, past or future. The field starts on today.
Read the weekday
The day of the week appears immediately, along with whether it is a weekend.
Check the extra detail
Week number, day of the year, quarter, and leap year status sit underneath.
Copy the answer
Copy the date and its weekday as a single line of text.
Why use this tool
Works for any date
Birthdays decades back and deadlines years ahead are handled the same way, with leap years accounted for correctly.
Standard week numbers
Week numbers follow the international standard, where weeks begin on Monday and week 1 holds the first Thursday of the year.
Day of the year and quarter
Useful for planning and reporting, where a date is often referenced by its position in the year rather than its calendar name.
Tells you how far away it is
Every result includes how many days ago the date was or how many days remain until it arrives.
Nothing leaves your browser
The calculation runs locally, so dates you look up are never uploaded or logged.
About this tool
This calculator answers one question directly: what day of the week does a given date fall on. People ask it about the day they were born, about a date in a contract, about an anniversary years in the future, and about a deadline that only matters if it does not land on a weekend. Enter the date and the weekday appears immediately, spelled out, with a note on whether it is a weekday or a weekend.
Underneath sit the details that usually come next. The week number follows the international standard, where weeks start on Monday and week 1 is the one containing the first Thursday of January, which is the definition used by most business and project calendars in Europe. Day of the year counts from 1 January, and the total shown alongside it accounts for leap years. Quarter and leap year status round it out.
Dates are handled as whole calendar days, so the answer never shifts because of a daylight saving change or the time zone your device happens to be in. For the gap between two dates, use the date difference calculator. To move a date forwards or backwards by a fixed period, add or subtract days does that, and the week number tool covers the current week at a glance.
Frequently asked questions
- What day of the week was I born?
- Enter your date of birth and the weekday appears straight away, along with how many days ago it was.
- How far back and forward does it work?
- Any date your browser can represent, which covers centuries in both directions. Leap years are handled correctly throughout.
- Which week numbering does it use?
- The international standard: weeks run Monday to Sunday and week 1 is the week that contains the first Thursday of the year.
- Is the date I enter uploaded anywhere?
- No. Everything is calculated in your browser, so the dates you look up stay on your device.
- Does daylight saving affect the answer?
- No. Dates are treated as whole calendar days rather than moments in time, so clock changes cannot move the weekday.
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