>>> How many months have 28 days? - elapsed 1.619 seconds - There are seven months that have 28 days in a year: January, April, June, September, November, and December. These months are part of the standard 365-day Gregorian calendar, with the exception of February, which has 28 days in a common year and 29 days in a leap year. The other months, such as March, May, July, and August, have 31 days, while February has 29 days in a leap year. The total number of days in a year is approximately 365.25, which is why we have leap years to account for the extra quarter day.