Is it me, or does this whole thing seem a tad over-complicated?
Reminds me of that old question we used to get asked at school:-
"If it takes a man and a half working at time and a half a day and a half to dig a hole and a half, how many apples are there in a barrel of grapes?"
17th would seem to be the third business day before 22nd which is the third business day before the 25th.
Thanks for the reply.