Age & date calculator
Age and the gap between two dates.
Questions
What does this tool do?
The Age & date calculator works out the exact span between two dates. Enter a birthday or any start date and an end date — today by default — and it returns the gap as years, months and days, the way a passport or a doctor would state an age, along with totals in weeks, days and hours. When the start date is a birthday, it also shows how many days remain until the next one. Leap years are handled by real date arithmetic, so a February 29 birthday comes out right.
How are years and months counted?
Years are full calendar years passed. Months and days fill in the remainder, the way a passport or a doctor would describe an age.
Are leap years handled?
Yes. A February 29 birthday rolls to February 28 in a non-leap year for the next-birthday count.
Can I count down to a future date?
Yes. When the end date is before the start date, the breakdown turns negative, so it works as a countdown too.