I'm saying that the first day of the week was Satruday evening for them. That the resurrection has nothing to do with Sunday as we know it now. Also, the first day of the week (Saturday even) is when they came to the tomb, but He he wasn't there, meaning that he had already risen before the day began.
Mat 17:23 And they shall kill him, and the third day he shall be raised again. And they were exceeding sorry.
Mat 16:21 From that time forth began Jesus to shew unto his disciples, how that he must go unto Jerusalem, and suffer many things of the elders and chief priests and scribes, and be killed, and be raised again the third day.
Luk 24:7 Saying, The Son of man must be delivered into the hands of sinful men, and be crucified, and the third day rise again.
1Co 15:4 And that he was buried, and that he rose again the third day according to the scriptures:
Not the fourth night, but the third day, according to you site, Saturday before sunset.
From Wednesday just before sunset to Saturday just before sunset is three days and three nights
Love Always,