How to use Day of the Week Calculator
- Choose a date.
- Read the weekday.
- Check the day of the year, week number and leap year status.
About this tool
The tool uses the proleptic Gregorian calendar, so it also works for dates far in the past or future. Week numbers follow the ISO 8601 standard, where weeks start on Monday and week 1 contains the first Thursday of the year.
Leap years are those divisible by 4, except century years that are not divisible by 400.
Frequently Asked Questions
- What day was I born?
- Enter your birth date to find the weekday.
- Is week 1 always in January?
- Usually, but the ISO week 1 can start in late December, and days in early January can belong to week 52 or 53 of the previous year.
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