What's a 'golden birthday'?

The year your age matches the calendar day you were born — born on the 17th, you have a golden birthday at age 17. People who were born on the 31st only get one between the ages of 28 and 31 depending on month, since not every month has a 31.

Does it count leap-day birthdays correctly?

Feb 29 births default to Feb 28 in non-leap years for the countdown — same rule most legal systems use. The exact-age math still uses the real Feb 29 anchor.

Birthday Countdown

Time

Live-updates every second from the browser clock. Shows the days/hours/minutes/seconds remaining to the next birthday, the exact age right now in years-months-days, the total days alive, total hours lived, and the weekday of the next five birthdays so you can start booking. The golden birthday — the year your age equals your day-of-month — is highlighted with whether it's already happened or still coming.

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How to use

Pick your birthdate (or anyone's). It stays in this browser only.
Watch the counter tick. The next five birthdays show below with their weekday.
On the day itself, the page swaps to a confetti banner.

Frequently asked questions

What's a 'golden birthday'?: The year your age matches the calendar day you were born — born on the 17th, you have a golden birthday at age 17. People who were born on the 31st only get one between the ages of 28 and 31 depending on month, since not every month has a 31.
Does it count leap-day birthdays correctly?: Feb 29 births default to Feb 28 in non-leap years for the countdown — same rule most legal systems use. The exact-age math still uses the real Feb 29 anchor.