Date calculator
Date Difference & Age Calculator
Find exact age or the calendar difference between any two dates.
Exact age
Choose two dates
Business days exclude Saturdays and Sundays but do not subtract public holidays.
Exact age
20 yr · 0 mo · 0 days
About this tool
Measure calendar time accurately
Calendar differences are not the same as dividing elapsed days by fixed month or year lengths. Months vary in length, and leap years add an extra day.
This calculator uses calendar-aware year and month boundaries, then reports remaining days. The business-day total excludes weekends but not country-specific holidays.
How it works
Compare two dates in three steps
- 1Choose age or difference
Use age labels or a general start and end date.
- 2Select both dates
Enter a birth or start date and the comparison date.
- 3Review the interval
See calendar units, total days, weeks, business days, and next birthday.
Common questions
Date Difference & Age Calculator FAQ
Are leap years included?
Yes. Calculations use real UTC calendar dates and account for leap days.
How are business days counted?
Weekdays after the start date through the end date are counted; public holidays are not removed.
Can the end date be earlier?
Yes. The tool identifies a reverse interval and displays its absolute size.