If this helps Ferris, I will summarize it, but I can provide a more detailed account if you need it. The prophecy found in Daniel Chap 9 about 70 weeks to finish off sin is a prophecy about the coming of the Messiah/Christ. The time starts with "the going forth of the word to restore and rebuild Jerusalem", then there would be 69 weeks to the Messiah (v9). We believe that decree happened in 455 BCE in the 20th year of the reign of Artaxerxes (Neh 2:1, 5-8). 70 weeks came and went with nothing happening, so we believe those weeks to be weeks of years. The 69th week (483 yrs) came in 29 CE, when Jesus became the Messiah at his baptism. His ministry was 3.5 yrs and he was cut off in the middle of that week (v27) thus finishing off sin in the year 33 CE, on Pentecost of that year holy spirit was poured out on Christs disciples thus the new covenant went into force at that point, but the law would remain in force till the end of the week, or the year 36 CE when the first uncircumcised gentile Cornelius was recorded as becoming a Christian under the covenant, thus ending the gathering of the anointed from fleshly Israel. All God's people from that point had to obey the law of the Christ from that point on.
Hope that makes sense Ferris.