I believe Daniel's 70th Week won't start til after Rapture (the church seized above which closes out the mysterious gap of 2 days inbetween the 69th and 70th Week .
Part of the seven year treaty (Daniel 9:27) signed, I think, is the beginning of the first 3 and 1/2 years of the Trib. The time needed for the temple to be rebuilt in order for the ac to desecrate it which happens smack in the midst of the 70th week ~
"Then he shall confirm a covenant with many for one week;
But in the middle of the week
He shall bring an end to sacrifice and offering.
And on the wing of abominations shall be one who makes desolate,
Even until the consummation, which is determined,
Is poured out on the desolate. . ." Daniel 9:27