So which is wrong? Jesus or the Gregorian calendar?
Did Jesus lie?
What is wrong is your incorrect assumption on what three days and three nights means.
To Jews, it meant three days.
If Jesus died on Wednesday :
Wednesday - day one
Thursday - day two
Friday - day three
Saturday - day four
Sunday - day five
Major fail.
The Scriptures say over and over, Jesus would rise on the third day.
Luke 24 tells us that third day was Sunday.
So for the simple minded who can’t count, here is what the Bible says:
Day one -Friday
Day two - Saturday
The third day - Sunday
The Church knows what day our Lord and Savior died, since the Church was there.
Heretical groups, not so much.