epoch
1. (Probably from astronomical timekeeping) A term used originally in Unix documentation for the time and date corresponding to zero in an operating system's clock and timestamp values. Under most Unix versions the epoch is 1970年01月01日 00:00:00 GMT; under VMS, it's 1858年11月17日 00:00:00 (the base date of the US Naval Observatory's ephemerides); on a Macintosh, it's 1904年01月01日 00:00:00. System time is measured in seconds or ticks past the epoch. Weird problems may ensue when the clock wraps around (see wrap around), which is not necessarily a rare event; on systems counting 10 ticks per second, a signed 32-bit count of ticks is good only for 0.1 * 2**31-1 seconds, or 6.8 years. The one-tick-per-second clock of Unix is good only until 2038年01月18日, assuming at least some software continues to consider it signed and that word lengths don't increase by then. See also wall time.
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2. (Epoch) A version of GNU Emacs for the X Window System from NCSA. [Jargon File]
Last updated: 2004年06月10日
Nearby terms:
EPIM ♦ epistasis ♦ EPL ♦ EPOC ♦ epoch ♦ EPP ♦ EPROM ♦ EPROM OTP ♦ EPROS ♦ EPS
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