Well here is a link that explains it really well. You have to realize there were two Sabbaths that year, the Gospel of John reveals it, and he also gives reference to the verse. He explains how all things to do with the Pass-Over Lamb, were fulfilled in Jesus by a Thursday Crucifixion.
One thing I did not notice, was whether he mentioned that a statement by Pilot, also confirms a Passover day Crucifixion.
http://www.tedmontgomery.com/bblovrv...day/index.html