Calculate exact calendar age between two dates.
← Back to CalculatorsAge & Date Calculator
Results update automatically as you type.
Select a month, then enter the 2-digit day and year. Supported years: 1 AD–5000 AD.
For informational purposes only.
About the Age & Date Calculator
The Age & Date Calculator calculates calendar age between two dates using complete years, complete months, and remaining days. Enter a starting date and ending date to see the elapsed calendar age and total days between them.
Calendar age differs from simply dividing the total number of days because months and years have different lengths. The calculator accounts for real Gregorian month lengths and leap years, including month-end and leap-day anniversaries.
Age and date example
For example, a date from January 31 to February 28 can represent one complete calendar month when February ends on the 28th.