The only contradiction is your own...
The contradiction is in the Bible. I respect the Bible enough to read it as it is, and not twist the meanings around in order to fit my preconceived idea. You're not even reading the Bible here, but making up a completely new Gospel.
Mark is clear on the dating. Matthew is also clear on the dating. We can start in Chapter 27, verse 62. This is after the happening of the crucifixion. It says that the next day, which is the day after the Preparation day, (so Matthew is talking about the Sabbath, which is Saturday), some people have a problem with the tomb. Here, were are being told once again that Jesus is killed on Friday. The next chapter follows up that the day after the Sabbath, at dawn on the first day of the week, the women went to the tomb.
So even clearer in Matthew, we have Jesus dying on Friday, guards being placed in front of the tomb on Saturday, and Jesus already having been risen on Sunday.
Luke is just as clear as well. Chapter 23 states Jesus was crucified on the Preparation day (a Friday), the next day is the Sabbath. It was exactly because of that that the women, who made the spices to anoint Jesus did not do so immediately. But they in fact did it the very next day (or were going to). And then on Sunday, the first day of the week, the day after the Sabbath, they go to the tomb.
With Luke, there is no wiggle room. Jesus dies on Friday. The women want to anoint Jesus right away, but can't because it becomes the Sabbath and follow the commandment. The very next day though, they go to the tomb. The story in Luke would make no sense if the women rested on the Sabbath, but then waited a couple of days to anoint Jesus.
Each of these Gospels make it clear that Jesus died on Friday, placed in the tomb before the Sabbath, and was raised by Sunday. That is not three days and three nights.