>>> How many months have 28 days?

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There are seven months that have 28 days in a year: January, April, June, September, and November. However, it's important to note that a leap year has 29 days in February, which means there are 8 months with 28 days in a leap year.

Leap years occur every 4 years, with the exception of century years that are not divisible by 400. For example, the years 1900, 2100, 2500, etc., are not leap years, while 1600, 2000, and 2400 are leap years.

To summarize, in a regular year, there are 7 months with 28 days, and in a leap year, there are 8 months with 28 days.