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 days between dates 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, enter 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 days between dates 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?
  • What is our age difference based on our birth dates?

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

Date Difference Calculator
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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:
Help Number of weeks between dates:
Help Number of months between dates:
Help Number of years between dates:
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Quick Answers to Related Frequently Asked Questions

How many weeks in a month?

Answer: 4.348 weeks

(365.25 average days per year divided by 12 months, divided by 7 days).

How many days in a month?

Answer: 30.4375 days

(1461 average days per 4-year period divided by 4 years, divided by 12 months).

Or, how many days in ...

January February March April May June
31 28/29 31 30 31 30
July August September October November December
31 31 30 31 30 31

How many weeks are in a year?

Answer: 52.1786 weeks

(365.25 average days per year divided by 7 days)

How many months in a year?

Answer: 12 months

What date are we today?

Answer:

Note: Refresh/reload the page to update this and all answers below this line.

How many days have passed this year?

Answer: days, not including today.

How many days left in ?

Answer: days, not including today.

How many weeks left in ?

Answer: weeks.

How many days to Christmas ?

Answer: days.

How many weeks till Christmas ?

Answer: weeks.

Date Difference Calculator Glossary of Terms

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Calendar, Time, and Date Calculators
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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 the two 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.

Number of weeks between dates: This is the number of weeks between the two dates entered in the top portion of the calculator.

Number of months between dates: This is the number of months between the two dates entered in the top portion of the calculator (days divided by average number of days in a month, 30.4375).

Number of years between dates: This is the number of years between the two dates entered in the top portion of the calculator (days divided by 365.25).

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