Time - (Duration, Elapsed Time, Period, Interval)

About

A duration is the period of time between two event occurrences, computed as the difference of the time coordinates of those events.

A duration is an amount of time that may be expressed in terms of unit of time

  • in a day-based fashion (ie 2 days 3 hour ..)
  • or in a time-based fashion, such as 45.7 seconds.

Elapsed time (wall clock) is a duration needed to perform a task.

Negative

A duration may be negative because of the leap second 1)

1)
https://blog.cloudflare.com/how-and-why-the-leap-second-affected-cloudflare-dns/




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