standard time

official standard time of a region (measured in relation to Greenwich, England)

Standard time is the result of synchronizing clocks in different geographical locations within a time zone to the same time rather than using the local meridian as in local mean time or solar time. The time so set has come to be defined in terms of offsets from Universal Time. (See more about standard time.)
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Universal Time (UT) is a timescale based on the rotation of the Earth. It is a modern continuation of Greenwich Mean Time (GMT), i.e., the mean solar time on the meridian of Greenwich, England, which is the conventional zero meridian for geographic longitude. GMT is sometimes used as a synonym for UTC. The old GMT has been split, in effect, into UTC and UT1.
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Noun
1. the official time in a local region (adjusted for location around the Earth); established by law or custom
(synonym) civil time, local time
(hypernym) time
(hyponym) Atlantic Time, Atlantic Standard Time

standard time
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