There are 12 months in a year. There are 12 equal periods in a year, each of which is called a month. Calender systems differ in the names of the months and the number of days in each.
In the Gregorian Calender, which is the most widely used calendar system in the world, the months are named:
The months having 31 days in a year are:
The months having 30 days in a year are:
February is the shortest month, with 28 days in a standard year and 29 days in a leap year.