John 12:1-2 From the Greek gloss:
"[1]
Before the feast of the Passover, Jesus knowing that His hour had come, this that He would depart out of the world to the father, having love, the own who were in the world, to the end He loved them, [2]
and supper taking place, the Devil already having put into the heart of Judas, son of Simon Iscariot, that he should betray Him..."
This is all one sentence in Greek. The present participle in "supper taking place" puts this meal before the Passover feast. So this meal is on the 13th/14th boundary.