However, God's days and Jewish days start at sunset.
If Jesus was buried on Good Friday sunset and arose on Easter Sunday morning, that was only one-and-a-half of God's days, or one day and two nights - thus invalidating his prediction and making him out to be a false prophet!
However, scripture nowhere teaches a "Good Friday". Scripturally, there were TWO SABBATHS in the Paschal week: the High Sabbath of Passover, and the usual weekly sabbath.