Lol, there is no UNLESS in the Scriptures.
Why do you think the disciples noted that Sunday was the THIRD DAY since Jesus died??
The Scriptures absolutely lock in Sunday as the day Jesus rose. Once that day is locked in, it is very simple to count backwards to find out the day He died.
3, 2, 1
( Wednesday or Thursday are absolutely eliminated as possibilities )
Good answer for liturgical defense, but not good Bible study.
You must count back Saturday night, Friday night, Thursday night, AT LEAST, which would put the Crucifixion prior to Friday.