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 1966-01-22 or Apr 5, 1985. You can also type words like today or yesterday, or use the American format, 2/11/2016.

Number of days between:
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›› February, 2016 calendar

Su M Tu W Th F Sa
  1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29      

Today is Thursday, February 11th, 2016. It is the 42nd day of the year, and in the 6th week of the year (assuming each week starts on a Sunday). There are 29 days in this month. 2016 is a leap year, so there are 366 days in this year.


›› Date calculator

number of days in 2016
number of days in 2015
number of days in 2017
number of days in 2035
number of days in January
number of days in February
number of days in March
number of days in April
number of days in May
number of days in June
number of days in July
number of days in August
number of days in September
number of days in October
number of days in November
number of days in December
number of days between December 19th, 1932 and February 11th, 2016
number of days between February 11th, 2016 and February 29th, 2020
number of days between January 20th, 1940 and November 6th, 1951
number of days between March 20th, 1981 and May 12th, 1999
number of days between November 5th, 1985 and October 6th, 2032
number of days between June 23rd, 1902 and June 16th, 1908
number of days between October 16th, 1943 and November 7th, 2006
number of days between March 30th, 1906 and February 6th, 1931
number of days between December 24th, 1937 and July 21st, 1949
number of days between October 29th, 1965 and April 26th, 2026
number of days between January 11th, 1934 and November 29th, 1982
number of days between January 2nd, 1914 and January 26th, 1975
number of days between July 16th, 1931 and April 13th, 1945
number of days between December 25th, 1906 and August 27th, 1908
number of days between March 4th, 1986 and April 18th, 2030
number of days between September 18th, 1918 and February 24th, 1932
number of days between September 2nd, 1944 and July 6th, 1988
number of days between March 20th, 1902 and August 15th, 2002
number of days between November 22nd, 1917 and December 16th, 1936
number of days between March 20th, 1926 and January 22nd, 2013
number of days between April 30th, 1913 and February 14th, 1915
number of days between March 30th, 1937 and August 21st, 1942

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