How many months of the year in Gregorian calendar have 31 days?

There are 12 months in a Gregorian Calendar year namely January, February, March, April, May, June, July, August, September, October, November, and December.

Of which are 7 months having 31 days namely

January, March, May, July, August, October, and December. And 4 months having 30 days namely April, June, September, and November.

While only February has 28 days, and 29 days in a leap year. A leap years occurs every 4 years.