1

24- 17 is 24 days minus 17 days. The remaining 1 819 202122 23 24 is calculated from the date of 17, so1should be added.

2

65438+1October 3 1- 19 is also subtracted, because 19 is also on holiday, so the holiday of 65438+1October is 31-.

The holiday time in February is1-1,and * * 1 1 is 12- 1.

So a * * * is 31-19+12-1= 31-19+12.