This is an interesting quote from Professor Bart Ehrman on the Historical Jesus, and sheds light on why we can not be dogmatic upon anything to do with him, day of death, hour of death, or whatever :
“I personally love the Bible. I read it all the time, in the original Greek and Hebrew; I study it; I teach it. I have done so for over thirty-five years. And I don’t plan to stop any time soon. But I don’t think the Bible is perfect. Far from it. The Bible is filled with a multitude of voices, and these voices are often at odds with one another, contradicting one another in minute details and in major issues involving such basic views as what God is like, who the people of God are, who Jesus is, how one can be in a right relationship with God, why there is suffering in the world, how we are to behave, and on and on. And I heartily disagree with the views of most of the biblical authors on one point or another. Still, in my judgment all of these voices are valuable and they should all be listened to. Some of the writers of the Bible were religious geniuses, and just as we listen to other geniuses of our tradition—Mozart and Beethoven, Shakespeare and Dickens—so we ought to listen to the authors of the Bible. But they were not inspired by God, in my opinion, any more than any other genius is. And they contradict each other all over the map.”
― Bart D. Ehrman, Did Jesus Exist?: The Historical Argument for Jesus of Nazareth