Traditional Culture Encyclopedia - Almanac inquiry - September 20th 1 9,1is Sunday. What day is today?

September 20th 1 9,1is Sunday. What day is today?

Tuesday. 20 1 September 1 and 1 October 1 are 30 days apart, 7 days a week, 30/7=4+2, so1October1is Tuesday, and this day is National Day/. To solve this problem, we must first find out the number of days that have passed, then find out how many weeks are left in the number of days that have passed, and then calculate according to the remainder.