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2. Fundamental Concepts > Date and Time

Date and Time

Two types of time are of interest to a process:

  • Real time is measured either from some standard point (calendar time) or from some fixed point, typically the start, in the life of a process (elapsed or wall clock time). On UNIX systems, calendar time is measured in seconds since midnight on the morning of January 1, 1970, Universal Coordinated Time (usually abbreviated UTC), and coordinated on the base point for timezones defined by the longitudinal line passing through Greenwich, England. This date, which is close to the birth of the UNIX system, is referred to as the Epoch.


  

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