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The point in time is a precisely determined moment in a time frame of reference . It can be specified on a time scale and - in contrast to the time span - has no extension.

  • A point in time is a formal, mathematical-physical model that can be used to describe a certain time with a number . It serves to represent simultaneity: Similar to the mathematical model of a point in space , a point in time has a duration of zero and thus no expansion in the dimension of time.
  • In physics, one can only speak of “exact times” to a limited extent, since the known physical laws beyond the Planck time (approx. 10 −43 s ) fail. Time then means:
    A measure of time that is sufficiently precise with regard to the accuracy of the calculation.
This makes the point in time a scale-dependent term. For example, if the second for the development of the solar system is unnecessarily short, it is a uselessly long period of time in relation to the switching speed of a microprocessor (see also: simultaneous measurement ).
  • In connection with network planning and scheduling , a point in time according to DIN 69900 Part 1 is a defined point in the process, the position of which is described by time units (e.g. minutes, days, weeks) and is related to a zero point. The term is then synonymous with the word “ appointment ”.


  • Christian W. Thomsen, Hans Holländer: moment and time. Scientific Book Society, Darmstadt 1984.
  • Irmgard Sonnen: A diary for 365 points in time. With scientific, philosophical and literary texts about point in time, moment, second, period, time measurement, etc., Düsseldorf 2004.

Web links

Wiktionary: point in time  - explanations of meanings, word origins, synonyms, translations


  1. DIN 69900 Part 1, 1987: Network plan technology terms