Time zone,UTC,Daylight savings, Standard deviation
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purpose .
UTC is the primary standard by which the world regulates clocks and time. Green wich mean time (GMT) is often used as a synonym for UTC.GMT predates UTC by nearly 300 years.
Daylight saving Time
Some temp zone countries uses daylight savings time for part of the year, typically by adjusting local clock time by an hour.
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