How many days are in each months?

Month Days
January 31
February 28 or 29. 29 days in leap years and 28 otherwise. See below for more notes.
March 31
April 30
May 31
June 30
July 31
August 31
September 30
October 31
November 30
December 31

Notes:

  • February has 28 days in common years and 29 days in leap years.
  • Leap years are years that are divisible by 4, but not by 100, unless they are divisible by 400. For example, the year 2000 was a leap year, but the year 1900 was not.