I raised this question in another thread. It was claimed that there were no disagreements in the Bible, or the story of Jesus. As I have done on various occasions, I raised this question, on what day was Jesus crucified?
Upon a close examination of the Gospels, this simple question becomes a little difficult. For reference, the translation I will be using for various verses will be the NRSV.
We will begin with what Mark states (I use Mark as Matthew and Luke used Mark as a source and generally agree).
Mark 14:12 "On the first day of Unleavened Bread, when the Passover lamb is sacrificed, his disciples said to him, 'Where do you want us to go and make the preparations for you to eat the Passover?"
In other words, the passage is referring to the Day of Preparation of the Passover; the day before Passover.
Mark 15:25, it still being Passover, tells us that jesus was crucified at nine o'clock in the morning. So clearly, in Mark, and the synoptics follow along, Jesus was crucified on the day of Passover. For instance, Matthew 26:17 states "On the first day of Unleavened Bread the disciples came to Jesus, saying, "where do you want us to make the preparations for your to eat the Passover?"
Another key here is that both Matthew and Mark place the first day of the Feast of Unleavened Break on the day of Preparation of the Passover; the day before Passover. Luke simply lumps it all together: Luke 22:1 "Now the festival of Unleavened Bread, which is called the Passover, was near." There is no doubt that in any of these three accounts, the authors are talking about the festival that lasted 8 days.
It should also be noted that the synoptics all portray the last supper as a Passover meal.
Now, moving to John, we see a difference. John 19:14 "Now it was the day of Preparation for the Passover; and it was about noon." The context of this verse is with Jesus' trial before Pilate. At this point, Jesus had already been flogged, and is now getting the verdict; he will be crucified, as stated in verse 16. So for John, is is the Day of Preparation for the Passover; or the day before Passover, that Jesus is crucified. Clearly, there is a disagreement here.
However, this is not the only evidence we have that Passover had not yet occurred. John 18:28 "Then they took Jesus from Caiaphas to Pilate's headquarters. It was early in the morning. They themselves did not enter the headquarters, so as to avoid ritual defilement and to be able to eat the Passover." Clearly, this shows that Passover had not yet occurred. Since, in the account of John, the last supper had already occurred, there is no way it could have been a Passover meal; according to John.
Now, some have claimed that John 19:31 ["Since it was the day of Preparation, the Jews did not want the bodies left on the cross during the sabbath, especially because that sabbath was a day of great solemnity."] points to the idea that it had to be Passover. However, the main reason for the confusion is a lack of understanding of the terms Day of Preparation for the Passover, and day of Preparation. Some try to combine these two phrases to make them both signify one thing. However, that simply can not logically be done.
The Day of Preparation for the Passover is a term that signifies the day before the Passover. On this day, the sacrificial lamb was slaughtered in the temple. The term can only mean one day, and that is the day before Passover.
The day of Preparation was the day before the Sabbath. In other words, it was Friday. The day of Preparation, and the Day of Preparation for the Passover though could be the same day on occasion. It all has to do with when Passover falls. A big mistake that Christians do is assume that it falls always on a Friday. That simply is not true. We place it on Friday because of theological reasons. However, the Jewish Calendar, and our calendar do not sync up perfectly. For instance, Passover this coming year (2011), Passover will begin at sunset of April 19th, which is a Tuesday.
That is why some translations use the term Special Sabbath. When Passover fell on the Sabbath, it was considered a Special Sabbath.
As we can see then, the synoptics and John disagree on the day in which Jesus is crucified.