How is exact age calculated?
Age counts complete years first, then complete months, then the remaining days. From 15 March 1990 to 10 June 2024 is 34 years, 2 months and 26 days. When a month is shorter than your birth day (for example, born on the 31st), the monthly anniversary falls on the last day of that month.
What if I was born on 29 February?
In common years this calculator treats 28 February as your birthday, so your age goes up on the last day of February. Some countries legally use 1 March instead; either way you are only a day apart.
Zodiac signs and the Chinese zodiac
Western zodiac dates can shift by a day from year to year, so a birthday right on the boundary may be listed differently elsewhere. The Chinese zodiac animal follows the lunar new year, not 1 January, so someone born in January or early February belongs to the previous year’s animal. This tool uses your browser’s Chinese calendar to get that right.
Is anything sent to a server?
No. Every calculation runs in your browser. Nothing you type here is uploaded or stored anywhere else.