Find the exact time between any two dates in years, months, weeks and days. Use it for age at a past event, age at death, length of service, or the gap between two milestones.
Enter a start date and an end date, then select “Calculate time between dates” to see the result.
An age is the time between a start date, usually a date of birth, and an end date. Changing the end date lets you see how old someone was at a past event, how old they will be on a future date, or how old someone was when they died. The same calculation measures any span, such as years of service or the time since an anniversary.
Full calendar years are counted first, then full months, then the remaining days. If the start day does not exist in a month, such as the 31st, the last day of that month is used. Total days are counted separately, so leap years are included. The end date is not counted as a full day.
Time between = end date − start dateStart date: 14 March 1985
End date: 2 September 2023
14 Mar 1985 → 14 Mar 2023 = 38 years
14 Mar 2023 → 14 Aug 2023 = 5 months
14 Aug 2023 → 2 Sep 2023 = 19 days
Time between = 38 years, 5 months, 19 days = 14,051 total days (2,007 weeks and 2 days).
To find age at death, enter the date of birth as the start date and the date of death as the end date. For example, born 3 June 1920 and died 21 November 1989 gives 69 years, 5 months and 18 days, or 25,373 days. The same method works for age at marriage, graduation, an exam or any other dated event.
The age difference calculator compares two birth dates and tells you who is older. This calculator measures the time from one date to a later date. Use it when you know the date of an event and want the age or the elapsed time on that date.
Enter a start date, such as a date of birth, and an end date. The calculator counts full calendar years, then full months and remaining days, and also shows total months, weeks and days between the two dates.
Yes. Enter the date of birth as the start date and the date of death as the end date. The result is the age at death in years, months and days, plus the total days lived.
No. It measures the time from the start date up to the end date, so the end date itself is not counted as a full day. Add one day to the total if you want both the first and last day included.
The calculation uses real calendar dates. Full years are counted first, then months and remaining days; when the start day is missing from a month, that month’s last day is used. Total days include 29 February where it falls in the range.
The calculator needs an end date on or after the start date. To compare two birth dates in either order, use the age difference calculator.
Not quite. The age difference calculator compares two birth dates and tells you who is older. This calculator measures the time from any start date to any later date, such as from birth to an event.
No. The calculation runs in your browser and the dates are not uploaded or saved by this website.