Mark 15:42 is strong evidence for Friday but at the end of the day if this is what you are focused on is way off the mark.
Amen and second it.
The Good Friday-Easter Sunday Question
https://www.freerepublic.com/focus/f-religion/2226464/posts
Gregory was wrong when he set up the calendar we use.
Scripture is never wrong.
To compare Scripture to a man created calendar and declare the the calendar is correct and Scripture is wrong, is a sure path to error.