(From TV programming) Normal high-usage hours on a time-sharing system 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-sharingITself, almost obsolete. The hackish tendency to late-night hacking runs has changed not a bIT. [Jargon File] (1995-01-18)