Easily calculate duration between two dates or find a future date by adding days, weeks, or months.
Select dates to see difference
Find out exactly how many days, months, and years you've been alive.
Go to Age Calculator →Use the Time Calculator for more granular duration math.
Go to Time Calculator →Calculate the number of working days between project start and deadline.
Find exactly when to send invites (e.g., "6 weeks before the wedding").
Determine the exact end date of a 90-day warranty or notice period.
The "Days Between" calculation typically excludes the end date (calculating the duration). For example, Jan 1 to Jan 2 is 1 day.
Yes, our calculator uses the standard Gregorian calendar rules, so February 29th is correctly accounted for in all calculations.