◷ Free Date Difference Tool

Date Difference Calculator

Calculate the exact difference between two dates in days, weeks, months, years, and calendar time. Get accurate results instantly.

Time Between Dates
—
Enter two dates to calculate the difference.
— Total Days
— Total Weeks
— Approx. Months
— Total Hours

What Is a Date Difference Calculator?

A date difference calculator determines how much time exists between two calendar dates. It can be used to calculate the number of days, weeks, months or years between a starting date and an ending date.

This tool is useful for measuring project durations, calculating deadlines, planning vacations, tracking contracts, determining event intervals, checking anniversaries and understanding how much time has passed between important dates.

Enter your start date and end date above to instantly calculate the difference without manually counting calendar days.

How to Calculate the Difference Between Two Dates

  • Select the Start Date.
  • Select the End Date.
  • Choose standard difference or inclusive counting.
  • Click Calculate Difference.
  • Review the total days, weeks, months and hours.

Date Difference Calculation Example

Example: January 1 to January 31

If the start date is January 1 and the end date is January 31, the standard difference is 30 days. If both the starting and ending dates are counted, the inclusive result is 31 calendar days.

Standard vs. Inclusive Date Difference

A standard date difference measures the elapsed time from the start date up to the end date. For example, January 1 to January 2 represents one elapsed day.

Inclusive counting counts both the starting and ending dates. Therefore, January 1 through January 2 represents two calendar dates when using an inclusive count.

More Date & Time Calculators

Date Calculator Add or subtract days, weeks, months and years from any date. Days Between Dates Calculate the number of days between two specific dates. Age Calculator Calculate exact age in years, months and days. Business Days Calculator Calculate working days while excluding weekends. Countdown Calculator Count down to birthdays, events, deadlines and important dates. Time Calculator Calculate and add time using hours, minutes and seconds.

Frequently Asked Questions

What is a date difference calculator?

A date difference calculator determines the amount of time between two calendar dates and can show the result in days, weeks, months, years, or calendar years, months and days.

How many days are between two dates?

Enter the start date and end date above. The calculator automatically determines the exact number of calendar days between the two dates.

Does the calculator include both dates?

Standard mode calculates elapsed time between the dates. Inclusive mode counts both the starting and ending date.

Can I calculate years, months and days between dates?

Yes. The calculator provides a calendar-style result showing years, months and days in addition to the total number of days.

Is the date difference calculator free?

Yes. The DaysCounter date difference calculator is completely free to use online.