How many days is one month?

The exact number of days in a month depends on the specific month and the type of calendar being used.

In the Gregorian calendar, which is the most widely used calendar system today, most months have either 30 or 31 days, with the exception of February, which has 28 days in regular years and 29 days in leap years.

In a regular year, the months of January, March, May, July, August, October, and December each have 31 days, while the months of April, June, September, and November each have 30 days. February always has 28 days.

In a leap year, February has 29 days. A leap year occurs every four years, with the exception of years that are evenly divisible by 100 but not by 400.

Therefore, in a regular year, the average number of days in a month is 30.4, while in a leap year, the average number of days in a month is 30.5.