Let’s start with the first goal of the 70th week. The Cross of Christ
finished transgression for those who believe so the demands of law do not have to be charged against them.
This is the legal basis of justification. Does it mean no one sinned after the Cross? Of course not, but the systematic code of written law, as given to Moses, has been abolished! Therefore, when the accuser brings his charge against a believer, God throws it out because that man belongs under grace. He is no longer under the former law, and for him the law has no authority to condemn.
“To the one who does not work but believes in him who justifies the ungodly, his faith is counted as righteousness, just as David also speaks of the blessing of the one to whom God counts righteousness apart from works: "Blessed are those whose lawless deeds are forgiven, and whose sins are covered; blessed is the man against whom the Lord will not count his sin." (Romans 4:5-8)
Some on Christian forums argue, “if a believer sins, how can there be no transgression?” It is because God does not impute (charge) sin to his account. Let it not be said, however, that He cheapens justice by flicking pardons with no respect to law at all.
“But He (Christ) was wounded for our transgressions.” What happened was that up until the Cross, the law required mandatory judgment upon all who transgressed it. After the atonement, however - after Messiah met the law’s demands - he effectively ended the law for those who believe, because his sacrifice paid the penalty for all transgression over all time. (PTL)
And that is what Daniel meant;
“Seventy weeks are determined for your people and for your holy city ... to finish the transgression.”