The month cannot be twenty-eight days

Question: Is it permissible to fast only twenty-eight days of the month of Ramadan?

Answer: It is established in the authentic, widely transmitted hadiths from the Messenger of Allah (peace and blessings be upon him) that the month does not fall short of twenty-nine days. So, if the entry of the month of Shawwal is established by the legal proof after the Muslims have fasted twenty-eight days, it is necessary that they broke their fast on the first day of Ramadan, and they must make up that day; because it is not possible for the month to be twenty-eight days, but rather the month is twenty-nine days or thirty.