http://www.abdicate.net/dates.aspx

Here is a breakdown:

Thursday 8 Nisan - Jesus is anointed by Mary for His death, though she may not have known that, John 12:3

Saturday 10 Nisan - Jesus has separated Himself from the people, Exodus 12:3 , John 12:36

Tuesday 13 Nisan - Jesus tells them to prepare the Passover meal. Their lamb killed before sunset on the 13th, and after sunset has the Passover with His disciples - deduced by the events on the 14th, the day of preparation for the Passover [of which Jesus had already partaken.]

Wednesday 14 Nisan - Jesus is tried early in the morning before dawn, brought before the people by Pilate at 6 am - Day of Preparation for the evening's Passover. Jesus is crucified at 9 am, noon the sun is blackened until when Jesus gives up the ghost around 3 pm and is put into the tomb hastily because the sun is going to set within the next couple hours and that starts the Sabbath. The Lamb of God had been sacrificed just like all the lambs that very day for that night's Passover!

Thursday 15 Nisan - Feast of Unleavened Bread - bread without yeast [life] - because the Bread of Life had died!!! - High Sabbath, also the day the Pharisees asked to have the tomb sealed because they knew of the promise of His resurrection, but thought His disciples would steal the body, Matthew 27:62 .

Friday 16 Nisan - Feast of Harvest - Numbers 28:26 , Leviticus 23:10-12 - then a few hours to prepare for the Sabbath that starts at sunset.

Saturday 17 Nisan - Typical Weekly Sabbath - from Friday sundown to Saturday sundown using Western dating system.

Sunday 18 Nisan - the day Jesus is raised from the dead any time after sundown at the end of the Sabbath on - Western dating system - Saturday night. Three days and three nights, Matthew 12:40 , in the tomb. Mary and the others go to the tomb on the first day of the week, Sunday, and realize that Jesus is risen, Matthew 28:1 , Mark 16:2 , Luke 24:1 , John 20:1

This is by far the hardest to understand because the Feasts and Sabbaths start after sundown, and are completed the next sundown, but during the night, the date changes [i.e. the number].