Find someone's exact age, or the exact difference between any two dates - years, months and days, plus the total number of days and weeks.
Nothing you enter is stored - this is pure arithmetic, computed and returned in the same request.
Enter a start date (a birth date, an anniversary, any date at all) and this tool works out the exact gap to today or to any other date you pick: years, months and days, plus the total number of days and whole weeks. It follows real calendar months and leap years, so the result is exact, not an estimate from a 365.25-day average.
Dividing the number of days by 365.25 gives an average, not an exact age: it drifts with how many leap years fall inside the span. This tool works in whole calendar units instead. It finds the largest number of whole months that fit between the two dates without passing the end date, then reports what is left as days. Example: from 15/08/1990 to 31/10/2026 is 36 years, 2 months and 16 days, which is 13,226 days or 1,889 whole weeks.
When the start day does not exist in a later month, the tool treats that month's last day as the anniversary. So 31/01/2026 to 28/02/2026 is exactly 1 month, and 31/01/2026 to 01/03/2026 is 1 month and 1 day. A 29 February birthday works the same way: in a year without 29 February the person is a year older on 28 February, so 29/02/2000 to 28/02/2001 is exactly 1 year. If a law or a contract sets its own rule for leap-day birthdays, follow that rule.
Total days is the plain count from the start date to the end date. The start day itself is not counted, so 01/01/2026 to 02/01/2026 is 1 day and the same date twice is 0 days. Total weeks is total days divided by 7 and rounded down, so 13 days shows 1 week. Both figures come straight from the two dates, independent of the years, months and days. To count the end date too, or working days only, use the Date Difference Calculator.
Many eligibility rules fix age on one date instead of today. Enter the birth date as the start date and the cut-off date as the end date. Example: for India's Civil Services Examination 2026, UPSC notice 05/2026-CSE requires a general-category candidate to have attained 21 years and not attained 32 years on 1 August 2026, so the date of birth must fall between 2 August 1994 and 1 August 2005. Born 01/08/1994, the tool shows exactly 32 years on 01/08/2026, so the upper limit is reached and the candidate is not eligible. Born 02/08/1994, it shows 31 years, 11 months and 30 days, still eligible. Age relaxations for reserved categories raise the upper limit; read them in the notice itself.
No. Neither date is written to disk, a database, a cache or a log. The site only counts that a calculation ran, with no dates attached.
The tool shows an error instead of guessing. Swap the two dates and try again.
Yes. The breakdown uses real calendar months and days, not a fixed 365.25-day year, so leap years and different month lengths are handled exactly.
The tool counts them a year older on 28 February. 29/02/2000 to 28/02/2001 shows exactly 1 year, while 27/02/2001 shows 11 months and 29 days.
The start date is not counted: 01/01/2026 to 02/01/2026 is 1 day. Add 1 if your rule counts both days, or use the "Include the end date (count both days)" option in the Date Difference Calculator.
The years of the two dates can be at most 150 apart, for example 1876 and 2026. That covers any lifetime; a wider span is refused rather than computed.
Put the birth date in A2 and the end date in B2 (or TODAY() for today). =DATEDIF(A2,B2,"Y") gives the full years and =DATEDIF(A2,B2,"YM") the months after them. For the days use =B2-EDATE(A2,DATEDIF(A2,B2,"M")), the days since the last monthly anniversary, which is how this tool counts them. Example: born 15/08/1990, on 05/11/2026 the three formulas give 36 years, 2 months and 21 days, the same as here. Microsoft advises against the "MD" unit of DATEDIF for the days, because it can return a negative number, a zero or an inaccurate result. DATEDIF also works in Google Sheets; some language versions of Excel translate the function names and separate arguments with a semicolon.
Months are counted by moving the start date forward one calendar month at a time. When the start day does not exist in the new month, it lands on that month's last day, so 31/01/2026 to 28/02/2026 shows 1 month and 0 days, and 31/01/2026 to 30/04/2026 shows 3 months and 0 days. The other way round, 30/04/2026 to 31/05/2026 is 1 month and 1 day. Excel's EDATE works the same: =EDATE(DATE(2026,1,31),1) returns 28/02/2026. When a notice or probation period ends at a month end, check the contract's own rule.
Enter the joining date as the start date and the last working day, or the date you are checking, as the end date. 01/04/2020 to 31/03/2026 shows 5 years, 11 months and 30 days, because the start date is not counted. If your policy or the law that applies counts both the first and the last day, use the day after the last working day as the end date: 01/04/2020 to 01/04/2026 shows exactly 6 years. Rules on rounding part years differ by employer and country, so check the one that applies before you put the figure on a letter or form.