How many months have 28 days?

All 12 months have 28 days. This is true because every month in the Gregorian calendar includes at least 28 days. While February is known for having only 28 days in common years and 29 days in leap years, it is important to recognize that other months—such as January, March, April, etc.—also encompass 28 days in addition to their typical longer durations. Therefore, if one considers the context that every month must contain that minimum number, the correct response is that all 12 months indeed have 28 days.