Age on a Specific Date
Age on date = Target date − Birth date2000-01-01 − 1990-06-15 = 9 years, 6 months, 17 days
Free online tool
Age on a Specific Date
Pick any date to calculate what your age was or will be on that day.
Instant calculation
Calculate Age on a Specific Date
Enter your birth date and any target date.
Your result
Calculation
Your numbers stay in this browser. Nothing is uploaded or saved.
Three clear steps
How to use this calculator
- 01
Enter your birth date
Type your birth year, month and day.
- 02
Enter the target date
Type the date you want to know your age on.
- 03
Calculate and read
See your exact age on that date in years, months and days.
The formula
How this calculation works
Subtract your birth date from the target date. The calculation handles leap years, month boundaries and all calendar edge cases.
Check the method
Worked examples
Each example follows the same formula used by the calculator.
Born Jun 15, 1990 — how old on Jan 1, 2000?
2000-01-01 − 1990-06-15 = 9 years, 6 months, 17 days9 years, 6 months, 17 daysBorn Feb 29, 2000 — age on Feb 28, 2026?
The calculator accounts for Feb 29 birthdays in non-leap years25 years, 11 months, 27 daysCommon questions
Questions about this calculation
Can I calculate my age on a date in the past?
Yes. Enter any past date as the target date to find out exactly how old you were on that day.
Can I calculate my future age?
Yes. Enter a date in the future to see what your age will be on that day.
What if the target date is before my birth date?
The calculator will show an error. Age cannot be calculated for a date before you were born.
Does this work for historical dates?
Yes, as long as both dates are valid calendar dates. The calculator works with any year from 1 AD onward.
How precise is this calculation?
It is precise to the day. The result shows years, months and days based on the exact calendar difference.
Continue calculating