For those interested in the chronology of Jesus’ life–especially when he was born–this study by Paul Maier is one of the most helpful things I’ve come across. Thanks to Professor Andreas Kostenberger for posting it to his website.
After surveying all the relevant evidence in and outside of the New Testament, Dr. Maier argues that the most probable date of the Nativity is November of 5 B.C. (though he thinks December is possible).
