John 19:3

(3) That St. John is not careful to give the time more than roughly “about the sixth hour.” The hours of that day may well be confused, for their sorrow would have made minutes seem as hours, and the sun, which on other days marked the hours, was on that day itself darkened. St. Matthew is equally uncertain at what exact time there was the cry with a loud voice (Matthew 27:46), and St. Luke does not give the exact time when the darkness commenced (Luke 23:44).