Days Between Dates Calculator

Pick two dates to see how far apart they are in days, weeks and in years, months and days.

Your result will appear hereFill in the fields and press “Calculate”.

Formula

days = end date − start date (+ 1 if both ends are counted)

Dates are converted to day numbers on the calendar, so month and year lengths are exact.

Count how many calendar days lie between the two dates.

Worked example

Across a leap year

Start date: 2024-01-01
End date: 2025-01-01
Count the end date?: No — count the nights between (default)

Days between

366 days

Weeks and days: 52 weeks, 2 days

Years, months, days: 1 year

Weekdays (Mon–Fri) in the range: 262

How it works

From 1 January 2024 to 1 January 2025 is 366 days because 2024 is a leap year. Normally you do not count the start date itself: 1 January to 2 January is 1 day. Choose “include the end date” when both days count, for example a hotel stay is nights but a conference is days.

The calendar breakdown (years, months, days) uses whole months, so 31 January to 1 March in a leap year is 1 month and 1 day. The result also shows weekdays (Monday–Friday) in the range; for a precise working-day count that handles holidays use the Working Days Calculator.

To count forward or back from a date use Date Calculator: Add or Subtract Time; for time until a future date see Days Until Calculator.

Assumptions and limits

If the end date is before the start date the two are swapped and a note says so.
Dates only — clock times and time zones are not involved.

Common questions

Does this count the start date?

No by default: the difference between 1 and 2 January is one day. Switch on “include the end date” to count both days.

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