eli5: Why does July & August have 31 days but February has only 28 ?

Question

eli5: Why does July & August have 31 days but February has only 28 ?

In: 123

Answer 1

31 was considered a lucky number by the romans. So when they made the Julian Calendar and added the months July and August (Named for Julius and Augustus Caesar) they wanted them to have 31 days.

March was the first month of their calendar, so they took the extra two days from the last month, February.