Free Date Difference Calculator

Subtract the earlier date from the later date. The result is the number of days between them. Our calculator also breaks this down into years, months, days, weeks, hours, and weekdays automatically.

This calculator counts the days between dates exclusively — meaning neither the start nor end date itself is counted. If you want to include one of the dates (like for age calculations or event durations), add 1 to the total days shown.

Enter the person's birth date as the start date and today as the end date. The result in years, months, and days is their exact age. The calculator automatically uses today's date as the default end date.

Calendar days count every day including weekends and holidays. Working days (weekdays) exclude Saturdays and Sundays but do not account for public holidays, which vary by country. This calculator shows both.

Yes. Set either date in the future and the calculator shows exactly how many days, weeks, months, and years until that date. It's useful for countdowns to events, deadlines, and milestones.

Month differences are ambiguous because months have different lengths (28–31 days). Different tools handle this differently. This calculator uses the most common convention: counting full calendar months, then remaining days — the same method used to calculate someone's age.