EARLY ON SUNDAY MORNING BEFORE SUNRISE, HE HAD ALREADY RISEN. WHEN DID HE RISE? DEFINITELY NOT ON SUNDAY MORNING.
Mark 16:2, 6 KJV
And very early in the morning the first day of the week, they came unto the sepulchre at the rising of the sun.  And he saith unto them, Be not affrighted: Ye seek Jesus of Nazareth, which was crucified: he is RISEN (not rising); he is not here: behold the place where they laid him.
Luke 24:1, 6 KJV
Now upon the first day of the week, very early in the morning, they came unto the sepulchre, bringing the spices which they had prepared, and certain others with them.  He is not here, but is RISEN (not rising): remember how he spake unto you when he was yet in Galilee,
John 20:1-2 KJV
The first day of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre.  Then she runneth, and cometh to Simon Peter, and to the other disciple, whom Jesus loved, and saith unto them, They have taken away the Lord out of the sepulchre, and we know not where they have laid him.
Matthew 12:40 KJV
For as Jonas was three days and three nights in the whale’s belly; so shall the Son of man be three days and three nights in the heart of the earth.
John 11:9 KJV
Jesus answered, Are there not twelve hours in the day? If any man walk in the day, he stumbleth not, because he seeth the light of this world.
So when Jesus says he will be 3 days and 3 nights in the heart of the earth, and he knows a day has 12hours.
Jesus had told the people that this will be the sign of his Messiahhood.
That just like Jonah was 3 days and 3 nights…..so shall he be in the heart of the earth.
The first thing the Jews would have done, was to call him a liar, if at all he would not have spent 3 days and 3/nights in the grave.
Do we have evidence for this? Yes we have
Matthew 27:62-64 KJV
Now the next day, that followed the day of the preparation, the chief priests and Pharisees came together unto Pilate,  Saying, Sir, we remember that that deceiver said, while he was yet alive, After three days I will rise again.  Command therefore that the sepulchre be made sure until the third day, lest his disciples come by night, and steal him away, and say unto the people, He is risen from the dead: so the last error shall be worse than the first.
The guards guarded his tomb for the entire 3 days and 3 nights.
Matthew 27:65-66 KJV
Pilate said unto them, Ye have a watch: go your way, make it as sure as ye can.  So they went, and made the sepulchre sure, sealing the stone, and setting a watch.
Matthew 28:4-6 KJV
And for fear of him the keepers did shake, and became as dead men .  And the angel answered and said unto the women, Fear not ye: for I know that ye seek Jesus, which was crucified.  He is not here: for he is risen, as he said. Come, see the place where the Lord lay.
The guards kept guard even after he had risen.
They kept watch for the entire time.
So clearly it means that Jesus was either a liar on His three days and three nights time duration or the interpretation to support a ‘goof Friday and ‘Easter Monday’ are false.