Last Supper: Last Supper or Passover Meal
I would like to hear the arguments for each position. The question has never entered my thinking till recently when I visited a Church that used regular bread during the Lord's Supper. Why did they do this? They didn't believe the Last Super was a Pass Over meal. If that is true then leavened bread was probably eaten during the last supper. What say you?
This post didn't seem to get any traction. I'll give it a push start: Below you will find passages from John that seems to indicate that the Last Supper took place before Passover. Take a look and tell me your thoughts.
John 13:1 Now before the Feast of the Passover, when Jesus knew that his hour had come to depart out of this world to the Father, having loved his own who were in the world, he loved them to the end. 2 During supper, when the devil had already put it into the heart of Judas Iscariot, Simon's son, to betray him, 3 Jesus, knowing that the Father had given all things into his hands, and that he had come from God and was going back to God, 4 rose from supper. He laid aside his outer garments, and taking a towel, tied it around his waist. 5 Then he poured water into a basin and began to wash the disciples' feet and to wipe them with the towel that was wrapped around him.
John 13.21 After saying these things, Jesus was troubled in his spirit, and testified, “Truly, truly, I say to you, one of you will betray me.” 22 The disciples looked at one another, uncertain of whom he spoke. 23 One of his disciples, whom Jesus loved, was reclining at table close to Jesus,  24 so Simon Peter motioned to him to ask Jesus  of whom he was speaking. 25 So that disciple, leaning back against Jesus, said to him, “Lord, who is it?” 26 Jesus answered, “It is he to whom I will give this morsel of bread when I have dipped it.” So when he had dipped the morsel, he gave it to Judas, the son of Simon Iscariot. 27 Then after he had taken the morsel, Satan entered into him. Jesus said to him, “What you are going to do, do quickly.” 28 Now no one at the table knew why he said this to him. 29 Some thought that, because Judas had the moneybag, Jesus was telling him, “Buy what we need for the feast,” or that he should give something to the poor. 30 So, after receiving the morsel of bread, he immediately went out. And it was night.
John 18.28 Then they led Jesus from the house of Caiaphas to the governor's headquarters.  It was early morning. They themselves did not enter the governor's headquarters, so that they would not be defiled, but could eat the Passover.
John 19.14 Now it was the day of Preparation of the Passover. It was about the sixth hour.  He said to the Jews, “Behold your King!”
John 19.31 Since it was the day of Preparation, and so that the bodies would not remain on the cross on the Sabbath (for that Sabbath was a high day), the Jews asked Pilate that their legs might be broken and that they might be taken away.
John 19.42 So because of the Jewish day of Preparation, since the tomb was close at hand, they laid Jesus there.