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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.)

Where daylight saving time is used, standard time may refer to the time without daylight saving time.

Contents 1 History 1.1 Great Britain 1.2 North America 2 Criticism 3 See also 4 References 5 Further reading

Standard time was first used by British railways on December 11, 1847, when they switched from local mean time to GMT. The vast majority of Great Britain's public clocks were using GMT by 1855.

Prior to the 1883, local mean time was used throughout North America, resulting in an inordinate number of local times. This caused convoluted regional and national train schedules. Sandford Fleming, a Canadian, proposed Standard Time at a Meeting of the Royal Canadian Institute on 1879 February 8. The heads of the major railroads met in Chicago to adopt the Standard Time System. The new system was adopted by most states almost immediately after railroads did so and finally officially adopted by the U.S. government almost fifty years later.

Standard time (and daylight saving time) has been criticised by a small but vocal minority. The bases of these criticisms range from distrust of government to a belief that it disturbs circadian rhythms, to preferring traditional, non-mechanical natural markers of time, like sunsets, noon and sunrise.^[1]

The counter-argument to circadian rhythm-based criticism is that there is no specific reason why companies and business have to open or close at a specific time. China now has a single time zone, even though it had five time zones in the past.

• Daylight saving time
• Local mean time
• Solar time
• Time zone
• Universal Time

• Ian R. Bartky (1989-01). "The adoption of standard time". Technology and Culture 30 (1): 25-56. 
• Eviatar Zerubavel (1982-07). "The standardization of time: a sociohistorical perspective". The American Journal of Sociology 88 (1): 1-23.