Birthday weekday by year
Handy for planning a celebration: does your birthday land on a Friday or mid-week? Choose the starting year and how many years.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter date of birth, starting year and number of years.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
For each year the same day and month is taken and the weekday is found from its serial day number. Age that year = year − birth year.
Example
Inputs: Date of birth = 1990-05-15, Starting year = 2,026, Number of years = 10. Result: Birthday weekday in the starting year: Friday; Date: Friday, May 15, 2026 (2026-05-15).
Limits and caveats
- A 29 February birthday is shown on 28 February in common years.
- The table shows up to 100 years at a time.
Questions about this tool
Why does my birthday move a weekday each year?
A year is 365 days, 52 weeks plus 1 day, so it moves one weekday, or two once a leap day has passed.
When does my birthday return to the same weekday?
Usually after 5, 6 or 11 years, depending on where the leap years fall.
Can I look at past years?
Yes. Pick any starting year after your birth year.