20 18 may 1 is Tuesday, so one year later may 1 is Wednesday. According to the analysis of the application problems of the nature of remainder in mathematics, there are 365 days from May 18 to May 19. A week is 7 days, just divide 365 by 7 and add the remainder. May 1 of 20 18 is Tuesday, and May 1 of 201of 9 is a week (2+ 1), which is Wednesday. Weeks, also called weeks, are a unit of time and the basis for working days and rest days.