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


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.


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

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is an extension of regular expressions that supports expressions as variables (so they can be reused) In this example, we will construct an expression that matches the part of a string time expression....
Data System Architecture
SQL - Interval

time duration is known as interval in SQL. An SQL interval data type descriptor contains: the name of the interval data type (INTERVAL); an indication of whether the interval data type is : a...
Data System Architecture

This section is time (as time that occurs against a timeline) It's a coordinate that orders the occurrence of events. A time on a timeline is called an instant or a timestamp A amount of time is...
Time - Leap Second

As the Earth rotates the length of the day varies and therefore a leap-second may be added or removed depending on the Earth's rotational changes. A leap second is a one-second adjustment that is occasionally...
Time - Time representation (Moment, Instant)

This section goes over the representation of time in a scalar way versus in a collection way (ie time series) Time is basically a numeric counter that increases over time. An instant in time can be represented...
Time - Unit

Measurement of time is built on units, such as: years, months, days, hours, minutes, and seconds Unit of time are used to: define an instant. The more unit, the more precision define...
Time - Wall Clock

Wall-clock time, or wall time is a duration that measure the time from the start to the completion of a task. Synonym: elapsed real time real time elapsed time Wall-clock time is the time that...

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