http://www.judaismvschristianity.com/Passover_dates.htm
The Nissan 14 was a WED, and Thursday would have been the High Sabbath, so that would mean Christ was crucified on Wed...Thursday would have began after sundown...
Thurs Night
Thurs Day
Fri night
Fri day
Sat night
Sat day
and resurrected after sundown on Sat which is actually Sun, first day of week....women find tomb empty Sun AM.
What is confusing to me is the night of that day is before the actual daytime, when it begins at sundown. Does that make sense?
That's the Jewish way of counting days, based on Gen 1 (there was an evening, there was a morning).
By your calculations, Jesus would have spent 4 nights in the tomb (Wed to Thu, Thu to Fri, Fri to Sat, and Sat to Sun) instead of 3!
I think the problem is setting the year in which Jesus was crucified. By your link, if you select A.D. 34, you get Nissan 14 on a Thursday and...
Thursday Day 1
Thursday to Friday Night 1
Friday Day 2 High Sabbath
Friday to Saturday Night 2
Saturday Day 3 regular Sabath
Saturday to Sunday Night 3
It doesn't really matter, it does not affect our salvation. But it kind of makes sense, doesn't it?