Birthdays
Next Birthday Countdown
Find the date, weekday and days until your next birthday.
Open tool →Birthdays
Half Birthday Calculator
Find your half birthday, defined here as six calendar months after your birthday.
1
Your dates
On this deviceYour dates are remembered here for 30 days. No account needed.
2
Your story in numbers
Every date has a story.
Enter your dates to discover your result and the next dates worth keeping.
Understanding your result
This tool defines a half birthday as six calendar months after the birthday. Other traditions use half a year in days; those conventions can produce a different date. Month-end dates are clamped where necessary.
See a worked example
Illustrative example, as of September 13, 2026.
- Date of birth
- 1991-05-16
November 16, 2026
Are my dates sent to a server?
Calculations run in your browser. Your dates stay on this device unless you choose to include them in a sharing link or image. “Clear my dates” removes them from local storage.