Look at the time frame for this; Peter denied Jesus, The cock crew, then we see Jesus being led to the chief priests STRAIGHTWAY in the Morning (as said in Mark), and EARLY in the Morning (as said in John). Now for both Jewish times and Roman times, Morning and Night are the same, it is still dark at night and light during the day. The only difference is when they consider the daily time frame to begin. Morning, is Midnight and onward, from the time the moon begins to descend and give way to the sun. Something to note, is that the Jewish timing, counts also the Third Watch (12am-3am), as “cockcrow,” and the Fourth Watch (3am-6am) as “morning.” Though roosters crow throughout the day (believe me, I know, I used to live by one!) they are most noted for crowing in the early hours of the morning, this probably caused the Jews to also think of the Third Watch as “cockcrow,” and honestly is probably the time when Peter heard it after denying Jesus! Then it says they led Jesus in the early morning, or straightway in the morning, which would then be considered perhaps as the Fourth Watch (also known as “morning” the way Third Watch is known as “cockcrow”), between 3am-6am. Then we see Jesus Crucified (in Mark) DURING the Third Hour, from 6am-9am, and in John at the “Sixth Hour” about to be led to the hill to be crucified, which knowing to be the Roman time of day, is about the beginning of the “Third Hour” at 6am.