Great Sermon! After extensive study on the dating of Jesus death we find a little confusion in the Gospels. Here is how it works out. The Jewish day begins at 6:00 PM the previous day. So if we are saying a Jewish Friday then it begins at 6:00 PM Thursday. Passover (Nisan 14) of the year of Jesus death was a Thursday, therefore it started at 6:00 PM Wednesday. Jesus had to be removed from the cross before Passover began. The last supper was actually at the beginning of preparation day, after 6:00PM Tuesday. Jesus stated that He wanted to have Passover meal with the disciples, not that He did. He was the Passover Lamb. Next Passover is a high Holy day, as well as the first day of the week of unleavened bread that begins the next day, Friday, and is considered a Sabbath day. Saturday, of course is always a Sabbath day. Jesus resurrected sometime after 6:00PM Saturday, which would be Sunday. That is three nights and three days.
I pray this helps any confusion. However as Dr. Cairns says, what is really important is that His blood washed away our sins so that we may stand before God.