Date Duration Calculator
Pick two dates — duration in three formats, leap years handled.
—Breakdown
—Exact
—In weeks
Calculated on your device.
Common questions
How are months counted between two dates?
Calendar-accurately: Jan 15 to Mar 15 is exactly 2 months even though the months differ in length. The years/months/days breakdown walks the actual calendar; the total-days figure is the exact count between the dates.
Does it handle leap years?
Yes — Jan 1 to Mar 15 of 2024 (a leap year) correctly counts 74 days including Feb 29, where 2023 gives 73.
Is the end date included in the count?
The count is the days between the dates — Monday to Friday is 4 days. For "how many days is my event including both ends," add one.