"...and Jacob's well was there. Jesus therefore, being wearied with his journey, sat thus by the well. It was about the sixth hour." John 4:6 ASV
It was translated as "noon" in the NIV
"...Jacob's well was there, and Jesus, tired as he was from the journey, sat down by the well. It was about noon." John 4:6 NIV
But The Halley's Bible Handbook says that the "sixth hour" is in the afternoon (6 p.m.), because it's roman hour system
"The 'sixth hour', v. 6, is the roman time, ie, 6 p.m." Halley's Bible Handbook page 474
In "Rome in Late Antiquity: Everyday Life and Urban Change, AD 312-609", by Bertrand Lançon, page 132, We found other time definition.
What time system John used?