Time Standard Measurement Standard (disambiguation)

Time Standard Measurement Standard may refer to:

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  SI second (unit of time)

  The International System of Units (SI) definition of the second, the primary global time unit used in scientific measurement.

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  International Atomic Time (TAI)

  A continuous atomic timescale maintained by timing laboratories, used as a basis for international timekeeping.

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  Coordinated Universal Time (UTC)

  The primary civil time standard used worldwide, derived from atomic timescales and adjusted with leap seconds.

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  GPS time (Global Positioning System time)

  The time reference used by the GPS system, based on atomic clocks and defined to align with civil time conventions.