Next birthday countdown
Enter your date of birth to get your next birthday and the days left until it, with a choice of rule for 29 February birthdays.
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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, today's date and 29 february birthdays in common 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
Next birthday = the same day and month this year if it has not passed yet, otherwise next year. Days left = birthday date − today.
Example
Inputs: Date of birth = 1990-05-15, Today's date = 2026-09-30, 29 February birthdays in common years = 28 February. Result: Days left: 227 days; Next birthday: Saturday, May 15, 2027 (2027-05-15); Weekday: Saturday.
Limits and caveats
- The count is in whole days by the calendar date and does not change during the day.
Questions about this tool
When do people born on 29 February celebrate?
On 29 February in leap years; in other years most choose 28 February and some 1 March. Pick the rule from the list.
What does a result of 0 days mean?
It means today is your birthday.
Can I count from a different date?
Yes. Change the today field to the date you want to count from.