Jesus' dying and burial on a "Wednesday" is half way through the week, however Dan 9:27 actually refers to the last week (7 yrs) of Daniel's 70 Week Prophecy. Jesus began preaching the gospel right after baptism at age 30 (Lk 3:23), in the fall. He preached for 3-1/2 years and was crucified, cut off, on the 14th of Abib, in the spring. Please review the UCG.org Study paper: http://streaming.ucg.org/files/papers/ucg-paper-the-70-weeks-prophecy.pdf
The beginning paragraph of your comment mentions the phrase "belly of the earth", as mentioned by Jesus. The actual wording by Jesus, as mentioned in Matt 12:40, is:
"For just as Jonah was three days and three nights in the belly of the great fish, so shall the son of man be three days and three nights in the heart of the earth."
Jesus did not say he would be "dead" 3 days and 3 nights, he said he would be in the grave 3 days and 3 nights. As the scriptures given show, he was laid in the tomb and sealed just before sundown on the 14th of Abib (Wednesday- 31AD). The next morning (Thursday), on the High Day - a Sabbath, the chief priests and Pharisees went to Pilate to have a guard placed (Mat 27:62-66).
The next day, Friday, when the Sabbath was past, the women went to the market (Mk 16:1) and returned and prepared the spices and fragrant oils and rested on the Sabbath according to the commandment [4th] (Lk 23:56). Jesus is still in the grave (2+2). The next, Sabbath He rose just before sundown, 3 + 3, just as He said. The next day, Sunday, the women saw the empty tomb before sunrise and were told He has risen, as He said (Jn 20:1; Mat 28:6).