The Last Supper and Passover

Ever wonder why the Gospel of John has the Last Supper occur before the Feast of Passover while the other gospels have it occur on the Feast?

John 13:

Now before the Feast of the Passover, when Jesus knew that His hour had come that He should depart from this world to the Father, having loved His own who were in the world, He loved them to the end.

And supper being ended [...]

Matthew 26:

Now on the first day of the Feast of the Unleavened Bread the disciples came to Jesus, saying to Him, “Where do You want us to prepare for You to eat the Passover?” 

Presbytera Jeannie explains it in Part 6 of her lessons on Exodus. Here is the excerpt.

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