Although the Last Supper was celebrated as the Passover meal, many scholars think that the word "before" means that this meal was the day before the official Passover, that Jesus died on the official date of the Passover, as our Passover lamb.
Cambridge Bible for Schools and Colleges (BibleHub.com)The events of the Passover are full of difficulty for the harmonist. It is however almost certain that the “Last Supper” was not the paschal meal, but was partaken of on the 14th, that is after sunset on the 13th of Nisan. It is quite certain, from John 18:28, that Jesus was crucified on the preparation, and although the synoptic narratives seem at first sight to disagree with this, it is probably only the want of a complete knowledge of the facts that creates the apparent discrepancy.
The order of events in the “Passion” was as follows: when the 14th commenced, at sunset, Jesus sent two disciples to prepare the feast for that evening, instead of for the following evening. A sign of hastening on the meal may be detected in the words “my time is at hand,” Matthew 26:18, cp. Luke 22:15, “with desire I have desired to eat this passover with you before I suffer.” The supper follows, which bears a paschal character, and follows the paschal ceremonial. Early in the morning of the 14th of Nisan the irregular sitting of the Sanhedrin took place. Then followed the formal sitting of the Sanhedrin, and the trial before Pilate, the “remission” to Herod, and, finally, the Crucifixion. This view meets the typical requirements of our Lord’s death completely. During the very hours when our Great High Priest was offering Himself as a sacrifice for our sins upon the cross, the Jewish people were engaged in slaying thousands of lambs in view of the paschal feast about to commence.
Jesus was not surprised by the events of that evening. He knew that it would happen and He previously described in detail what would happen to Him:
Matthew 20:18-3418 “Behold, we are going up to Jerusalem; and the Son of Man will be delivered to the chief priests and scribes, and they will condemn Him to death, 19 and will hand Him over to the Gentiles to mock and scourge and crucify Him, and on the third day He will be raised up.”
Mark 10:33-3433 saying, “Behold, we are going up to Jerusalem, and the Son of Man will be delivered to the chief priests and the scribes; and they will condemn Him to death and will hand Him over to the Gentiles. 34 They will mock Him and spit on Him, and scourge Him and kill Him, and three days later He will rise again."
John tells us that even knowing all that would happen to Him, He loved His disciples until the end. Even after being betrayed by Judas and the rest abandoning Him, His love for them did not waiver.
It is a fact in scripture that Jesus loves us. This is why He came into this world. It is also clear that His love for us never wanes or fails. Like James says "the Father of lights, with whom there is no variation or shifting shadow," His light remains steady and constant. " “For I, the Lord, do not change;" (Mal. 3:6)