When reading the synoptic Gospels one could easily believe that they were talking about the weekly Sabbath. But John who wrote his Gospel some 30 years later corrected the historical record of the event. He tells us that it was a "High Sabbath." The high Sabbath was the first day of unleavened bread. A high Sabbath was not as strict as the weekly Sabbath in that you could do some necessary work.
So what this means is that Jesus could have been crucified on any day of the week. And so I backed up the day of the crucifixion just enough so that there was a full three days for Him to be in the tomb.
The Jewish day changed when three medium stars appeared in the sky. This would have been approximately 7:00PM.
The evening (Tamid) sacrifice occurred at 2:30PM everyday. On Passover it was moved back to 1:30 in order to sacrifice all of these 10's of thousands of lambs. In order to do this all of the Priests came into the Temple to assist. They did this bucket brigade style.
So the timetable looks like this...
3rd day, Nissan 13th - Lambs sacrificed in late afternoon
4th day, Nissan 14th Passover day - Lambs roasting until probably 9-11 O'clock? Celebrated Passover until late
4th day, Jesus arrested probably after midnight was tried the next morning early.
4th day, Jesus crucified - travailed between noon and three o'clock.
4th day, Disciples rushed to interr him before the start of the High Sabbath (Unleavened Bread) at 7:00PM
5th day, In the tomb from 7:00PM until 7:00 Pm - one full day
6th day, In the tomb from 7:00PM until 7:00PM - two full days
7th day, In the tomb from 7:00PM until 7:00PM - three full days.
1st day, (First day of the week) Arose at 7:00PM (Theoretically) (Start of Sunday)
1st day, Followers arrive at the tomb early to find He had already arisen. Record doesn't say when He arose.
1st day, This timetable shows a 12 hour lapse between when He arose and when His followers arrived at the Tomb.