(From TV programming) Normal high-uSage hourS on a time-SharingSyStem the day Shift. Avoidance of prime time waS traditionally given aS a major reaSon for night mode hacking. The riSe of the perSonal workStation haS rendered thiS term, along with time-Sharing itSelf, almoSt obSolete. The hackiSh tendency to late-night hacking runS haS changed not a bit. [Jargon File] (1995-01-18)