Date & Time
Day of the week
Find which day of the week any date falls on, past or future.
- Instant
- Free
- Private (processed locally)
- No sign-up
What day does a date fall on?
Pick a date: the tool shows the day of the week, the ISO week number, the day of the year and whether it is a weekend.
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Pick the date
Past or future.
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Read the day
Monday, Tuesday…
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Useful details
ISO week, day of year.
What you get
- The day name, localized
- The ISO week number
- The day of the year (1 to 366)
- Weekend: yes or no
Examples
| Date | Day |
|---|---|
| 2000-01-01 | Saturday |
| 2024-02-29 | Thursday |
| 2025-12-25 | Thursday |
Based on the Gregorian calendar. 100% local and instant calculation.
Frequently asked questions
How do I find my birth day?
Enter your date of birth: the tool shows the matching day of the week, computed with the Gregorian calendar.
What is the ISO week number?
It is the week numbering per the ISO 8601 standard, where the week starts on Monday and week 1 contains the year’s first Thursday.
Do future dates work?
Yes. The calculation is valid for any past or future date in the Gregorian calendar.
Is my data uploaded?
No. The calculation is purely local and instant, with no network calls.