How many days are there from April 25th to May 25th?

3 1 day. According to the query calendar, there are 30 days in April and 3 1 day in May, so we can know through calculation that a certain * * * from April 25th to May 25th is 3 1 day. The month refers to the month, which is the unit of time in the calendar. Traditionally, the phase change period of the moon is considered as the length of one month.