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Mathematical olympiad:1:101October 4th-10/October 28th.
1:65438+1October 4th-65438+1October 28th. Find the elapsed days of 28-4=24 days (this does not count 10.4 and 10.28). Add it if you want to count it.

2. April 8th-July 20th, the number of days in the past. May and July are big months, with 3 1 day, which should be 2*3 1=62 days, 4.8-5. 1 * * with 30+ 1-8=23 days, 7.1-.

3: June12-September 10, counting the past days.

6.12-7.1a * * has 30+1-0/2 =19 days, July 3 1 day, August 30 days, 9.1-.

The following year is 4:165438+1October 25th-65438+1October 4th.

11.25-1.30 * * There are 30-25=5 days, 65438+ February is the big month, 3 1 day,1-65433.

I'm already confused. There may be many mistakes in it. For reference only. I'm not good at math. Orz hopes to help you or something.