'O'clock' in the Bible

About three o'clock one afternoon he had a vision, and distinctly saw an angel of God enter his house, who called him by name, saying, "Cornelius!"

Then, calling to him two of the Captains, he gave his orders. "Get ready two hundred men," he said, "to march to Caesarea, with seventy cavalry and two hundred light infantry, starting at nine o'clock to-night."