One of the so-called contradictions that we hear brought up concerns the disagreement between the Gospel of Mark and the Gospel of John as to the time of the crucifixion of Jesus.
Mark 15:25 (KJV) states, “and it was the third hour, and they crucified him,” while in John 19:14 (KJV) we read, “And it was the preparation of the Passover, and about the sixth hour: and he saith unto the Jews, Behold your King!”
This does indeed present a difficulty, since Mark has Jesus being crucified at the third hour, or nine o’clock in the morning, according to Jewish reckoning, while John places Jesus before Pontius Pilate at about the sixth hour, or noon.
Many say this discrepancy is impossible to reconcile, while others say the difference between the two is a result of a mistake early in the copying process. Neither of these two views is plausible or acceptable.
There are two possible solutions which carry reasonable weight. One solution centers on the word “about” in John’s statement of the time. He reveals that it was not exactly the sixth hour, but only about this time.
Also, Mark’s account does not force us to believe that it was at exactly 9 a.m. when Jesus was put on the cross. This can be observed by understanding the way the New Testament calculates time.
The night was divided into four watches, each consisting of three hours (see Mark 13:35), and the day was to some extent likewise divided into periods. In light of this, we can imagine that Mark’s statement about the “third hour” simply meant that Jesus was crucified sometime during the third hour (between nine o’clock and noon), while John’s statement that the trial ended about noon can mean before noon.
Thus, if the crucifixion took place between nine o’clock and noon, Mark could have placed it at the earlier period (nine o’clock) and John at the later period (noon) without there being any discrepancy.
“If the crucifixion took place midway between nine and twelve o’clock, it was quite natural that one observer should refer it to the former, while another referred it to the latter hour.
“The height of the sun in the sky was the index of the time of the day; while it was easy to know whether it was before or after midday, or whether the sun was more or less than halfway between the zenith and the horizon, finer distinctions of time were not recognized without consulting the sun dials, which were not everywhere at hand” (The Expositor’s Greek New Testament, commenting on John 19:14).