Date Difference Calculator to
Calculate Days Between Dates

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The online Date Difference Calculator on this page will quickly calculate the number of days between dates, and more!

This free online time between dates calculator will calculate the number days between two dates and then translate those number of days to their equivalent years, months, weeks, hours, minutes, and seconds.

Note that if you would like to see what the date would be if you were to add days to a date or subtract days from a date (or add or subtract other time units, such as weeks, months, years, etc.), please visit the Date Time Calculator.

Many Cool Uses!

Want to know how many days until a future event? Simply enter today as the starting date and the future event date as the ending date and the time duration calculator will instantly show you how long you have left to wait.

Or, want to know how much time has elapsed since a past event? No problem. Just enter the past date as the starting date, ender today's date as the ending date, press the Calculate Date Difference button and viola!

Here are just a few of the many uses for this time duration calculator:

  • How many days until my birthday?
  • How many days left until Christmas?
  • How many days until our vacation?
  • How many weeks left of the school year?
  • How many days do I have left to meet my deadline?
  • How many years, months, and days until my retirement?
  • How long have we known each other?
  • How long have we been married?

With that, let's use the time duration calculator to calculate the number of years, months, days, weeks, hours, minutes, and seconds between two dates.

Date Difference Calculator
Calcy sign introducing Date Difference Calculator

Instructions: Select the month and day and enter the 4-digit year for the starting date, repeat for the ending date, and then click the "Calculate Date Difference" button.

Mouse over the blue question marks for a further explanation of each entry field. More in-depth explanations can be found in the glossary of terms located beneath the Date Difference Calculator.

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Help Starting date:
Help Ending date:
Help Number of days between dates:
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Date Difference Calculator Glossary of Terms

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Starting date: Select the month and day and enter the 4-digit year of the beginning date. Note that the starting year must be less than 4000.

Ending date: Select the month and day and enter the 4-digit year of the ending date. Note that the ending year must be less than 4000, and the ending date must be later than the starting date.

Number of days between dates: This is the number of days between dates entered in the top portion of the date difference calculator. Note that the number of days between dates does not include the day of the ending date. Simply add one to the result to include it.

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