Setting Dates for the Gospels

One of the questions I often get asked on the blog is how we know when the Gospels were written. I’ve answer the question at some length before, and thought it might be useful to answer it again. Here’s what I said years ago, and looking at it, I’d say the same thing again. In fact, I will. Here:

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QUESTION:

How are the dates that the Gospels were composed determined? I’ve read that Mark is usually dated to 70 or later...