Age CalculatorYTScript

Days Between Dates

Pick a start date and an end date to see the span in years, months, weeks, and total days. By default the end date is not counted.

Runs in your browser — dates never leave this device
Start date
End date

From 1 January to 3 January, leaving this off counts 2 days; turning it on counts 3.

Age will show up here Enter a date of birth. You can change the “age at” date if you want a day other than today.

How to use it

  1. 1

    Enter the start date and the end date.

  2. 2

    Read the span. The default does not include the end date.

  3. 3

    Turn on “Include the end date” if you want both days counted, as in 1 January to 3 January = 3 days.

How this calculator counts age

The default matches ordinary “how many days from this date to that date” counting: from 1 January to 3 January is 2 days. Including the end date counts both ends, so the same example becomes 3 days.

Years and months in the result use the same anniversary-day rule as the age calculator. Total days are a simple civil-day count and are not affected by daylight saving.

Other date tools

Age calculatorExact age in years, months, and daysChronological age calculatorAge on an assessment date, with Y;M;D copyBaby age calculatorWeeks, calendar months, and days after birthDog age calculatorA size-based estimate in human yearsCat age calculatorAn estimate in human years from a public chartAdd or subtract daysMove a date by years, months, weeks, or daysDay of the week calculatorWeekday, day of year, and ISO week

Questions

Why is 1 January to 3 January two days, not three?

Because the end date is left out by default — two midnights pass between the start of the 1st and the start of the 3rd. Switch on “Include the end date” to count 3.

Does the count include time of day?

No. This page counts calendar dates only.

What if I need to add days instead?

Use the date add tool on this site, which starts from one date and moves forward or backward.