Christians have long celebrated The Last Supper on the Thursday before Easter. But now new research claims the "Holy Thursday" meal took place a day earlier.
According to a report from the news agency AFP, Professor Colin Humphreys has concluded in his new book "The Mystery Of The Last Supper" that the confusion arose because of a calender mix-up.
While Matthew, Mark and Luke all say the Last Supper coincided with the start of the Jewish festival of Passover, John claims it took place before Passover.
Humphreys explains this biblical inconsistency by the fact that Jesus -- along with Matthew, Mark and Luke -- may have been using a different calendar than John. Jesus used the old-fashioned Jewish calendar rather than the lunar calendar, which was in widespread use then and is still used today.
"Whatever you think about the Bible, the fact is that Jewish people would never mistake the Passover meal for another meal, so for the Gospels to contradict themselves in this regard is really hard to understand," Humphreys said.
"Many biblical scholars say that, for this reason, you can't trust the Gospels at all. But if we use science and the Gospels hand in hand, we can actually prove that there was no contradiction."
So Humphreys said The Last Supper was actually Wednesday, not Thursday.
Humphreys is also calling for Easter Day to be set on a fixed date. He believes that date should be April 5.