Surely you are not saying that we must know which day Jesus was executed to be saved?
Thanks for your question.
Ben Hur was writen by an atheist that had the intention to destroy the christian faith by demostrating that all is nothing but a big myth, the Jesus did never existed for real and that the Gospels are filled with contradictions; internal contradictions and external contradictions (with history and geography). He did study the matter in deep and concluded that Jesus Christ and the Gospels are an authentic acount of real events of real people. Jesus Christ came to be real and true. Converted into chritianity he did write a different book of what he had on mind; he wrote Ben Hur.
Many people have litle instruction concerning Jesus and the times of the Gospels. I have been preaching the Gospel and the salvation in Christ, in a person to poerson strategy. I can tell you that I have preach to many hundred persons in a personal,m face to face talk. And I can agree with you that not even one single time I was asked at what time or what day did Jesus be crucified (I dont like "executed" or "dued"; nobody took his life but he give it). The reason for this is in some extend - not only - in the fact that the most of the people have litle instryction on the matter and in consecuense have not doubts.
When I did recieve the nesage, when I was told that God has a new life for me in Christ; I did not care on times or places; I jumped in immediately withou questioning any more. That very moment in wich I recieved Jesus Christ as my personal Savor and Lord, I got the eternal life. All of that despite the day or the hour in wich Christ were crucified. But few weeks later, when I was encouraged to read the Bible, the NT and the Gospels, I did commence to have questions. Eventually, one of my questions was concerning the confusion on wich day Jesus Christ was crucified. As a result, I did - 30 years later - prepared the harmony of the Gospels. It was not necesary for me to know the time in order to wish the salvation and to get the salvation. But it was a necesity for me for growing up in the solid groud that the Bible, the NT, the Gospels and the acount of the Pasion - in wich we base our theology - is absolutely reliable and contain nor errors or contradictions.
The question is: If instead of preaching to normal people on the street and parks; me or you have to preach to an intelectual person who have studied the Gospels...what answer will we give when asked about the time of the crucifixion. Paul is telling us to be ready to give reason of our faith. If we are trying to get a body to believe that Jesus did died for his sins, and resurrected for his eternal life; we better be prepared to answer all questions that make the cross look like a myth.
If we congregate with brother, we better have a good answer - not a smart excuse to pull away - when a new christian being nures by spiritual milk, ask us about the aparent contradictions on the acount of the Pasion. How come that Jesus were crucified by 9am and was at Pilates by noon? How is that Jesus was crucified the 15th, if the 15th is not a preparation day? How is that the Sun rises when Jesus were take to the Sanedrin, and rises againg when he was take to Piklates? We can be exercised in void answers as "that is not what matter"; or we can be litle more responsible and try - at least try - to found out the true asnwer.