If He was buried on Wednesday at 5:59pm, then Wednesday night plus daytime Thursday are the first night and day, Thursday night plus daytime Friday the second night and day, and Friday night and daytime Saturday the third night and day. Besides, He cannot have been raised on Sunday at 6pm because we are told:
“1 ¶ Now after the Sabbath, as the first day]of the week began to dawn, Mary Magdalene and the other Mary came to see the tomb. 2 And behold, there was a great earthquake; for an angel of the Lord descended from heaven, and came and rolled back the stone from the door, and sat on it. 3 His countenance was like lightning, and his clothing as white as snow. 4 And the guards shook for fear of him, and became like dead [men]. 5 But the angel answered and said to the women, “Do not be afraid, for I know that you seek Jesus who was crucified. 6 “He is not here; for He is risen, as He said. Come, see the place where the Lord lay.” (Mt 28:1-6 NKJV)