The Jews reckoned the day from sunset to sunset (Lev 23:32). It was originally divided into three parts (Psa 55:17). "The heat of the day" (1Sa 11:11; Neh 7:3) was at our nine o'clock, and "the cool of the day" just before sunset (Gen 3:8). Before the Captivity the Jews divided the night into three watches, (1) from sunset to midnight (Lam 2:19); (2) from midnight till the cock-crowing (Jdg 7:19); and (3) from the cock-crowing till sunrise (Exd 14:24). In the New Testament the division of the Greeks and Romans into four watches was adopted (Mar 13:35). (See WATCHES.) View

 The division of the day by hours is first mentioned in Dan. 3:6, 15; 4:19; 5:5. This mode of reckoning was borrowed from the Chaldeans. The reckoning of twelve hours was from sunrise to sunset, and accordingly the hours were of variable length (Jhn 11:9). View

 The word "day" sometimes signifies an indefinite time (Gen 2:4; Isa 22:5; Hbr 3:8, etc.). In Job 3:1 it denotes a birthday, and in Isa 2:12, Act 17:31, and 2Ti 1:18, the great day of final judgment. View