Date to Date Calculator

Start Date

End Date

Include end date (add 1 day)

The Date to Date Calculator is your comprehensive tool for finding the exact period between any two dates on the calendar. Whether you're tracking project timelines or counting the days since a historical event, this calculator provides the breakdown you need.

How to use the date to date calculator

Select a Start Date.
Select an End Date (defaults to today).
Check "Include end date" if you want to count the final day in the total.
Click Calculate to see the duration in Years/Months/Days and alternative units (Total Days, Seconds).

Day count calculator vs Year to date

This tool serves multiple purposes. As a Day Count Calculator, it simply subtracts one date from another to give you the total count. As a Year to Date (YTD) calculator, you can enter January 1st as the start date and today's date as the end to see how far into the year we are.

Between dates: curiosities about time

When calculating time across centuries, one must account for calendar shifts. For example, the Julian calendar was replaced by the Gregorian calendar in 1582, skipping 10 days! While this calculator uses the standard proleptic Gregorian calendar for consistency, it's fascinating to note how human measurement of time has evolved.

Did you know? Shakespeare and Cervantes died on the same date (April 23, 1616), but not on the same day! England was still using the Julian calendar while Spain had switched to Gregorian. They actually died 10 days apart.