This site provides an online date calculator to help you find the difference in the number of days between any two calendar dates. Simply enter the start and end date to calculate the duration of any event. You can also use this tool to determine how many days have passed since your birthday, or measure the amount of time until your baby's due date. The calculations use the Gregorian calendar, which was created in 1582 and later adopted in 1752 by Britain and the eastern part of what is now the United States. For best results, use dates after 1752 or verify any data if you are doing genealogy research. Historical calendars have many variations, including the ancient Roman calendar and the Julian calendar. Leap years are used to match the calendar year with the astronomical year.

Note: If you're trying to figure out the date that occurs in X days from today, switch to the Days From Now calculator instead. Or to calculate the date that is X days from a particular date, use the Days From Date calculator. Finally, if you want to choose a day in the week and count how many times it occurs in a given year, try out the How Many Days calculator.


›› Enter dates

Enter two dates below to find the number of days between them. For best results, avoid entering years before 1753. Examples include 1937-08-07 or Sep 6, 1966. You can also type words like today or yesterday, or use the American format, 12/3/2016.

Number of days between:
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›› December, 2016 calendar

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Today is Saturday, December 3rd, 2016. It is the 338th day of the year, and in the 48th week of the year (assuming each week starts on a Sunday). There are 31 days in this month. 2016 is a leap year, so there are 366 days in this year.


›› Date calculator

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number of days between October 13th, 1965 and June 30th, 2017
number of days between September 16th, 1903 and August 28th, 1905
number of days between September 13th, 1926 and April 9th, 1939
number of days between February 18th, 1929 and September 15th, 1975
number of days between April 10th, 2006 and July 14th, 2017
number of days between August 2nd, 1907 and October 22nd, 1908
number of days between May 18th, 1914 and March 29th, 1995
number of days between September 22nd, 1915 and October 7th, 1966
number of days between February 20th, 1953 and September 25th, 1955
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number of days between June 20th, 1911 and November 4th, 1950
number of days between March 29th, 1904 and January 21st, 1907

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