Michigan Michigan () is a state in the Great Lakes region of the upper Midwestern United States. With a population of nearly 10.12 million and an area of nearly , Michigan is the 10th-largest state by population, the 11th-largest by area, and the ...

observes

Eastern Time The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, the state of Quintana Roo in Mexico, Panama, Colombia, mainland Ecuador, Peru, and a small port ...

, except for four counties and two cities, which observe Central Time.

History

Before time zones were introduced, every place used local observation of the sun to set their clocks, which means they used

local mean time Local mean time (LMT) is a form of solar time that corrects the variations of Solar time#Apparent solar time, local apparent time, forming a uniform time scale at a specific longitude. This measurement of time was used for everyday use during the ...

, every city different based on their longitude. Detroit used 05:32:11 west of Greenwich and Menominee 05:50:27 west of Greenwich. Time zones were introduced in the United States in 1883. They were introduced in different years based on local decisions. Michigan adopted Central Standard Time throughout the state effective September 18, 1885. In 1915, Detroit changed to Eastern time, followed by most of the rest of the state in 1931. In 1967, when the

Uniform Time Act The Uniform Time Act of 1966, , was a Law of the United States to "promote the adoption and observance of uniform time within the standard time zones" prescribed by the Standard Time Act of 1918. Its intended effect was to simplify the officia ...

came into effect, the Upper Peninsula went under year-round CST, with no

daylight saving time Daylight saving time (DST), also referred to as daylight savings time or simply daylight time (United States, Canada, and Australia), and summer time (United Kingdom, European Union, and others), is the practice of advancing clocks (typicall ...

. In 1973, the majority of the peninsula switched to Eastern Time; only the four western counties of Gogebic,

Iron Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in f ...

, Dickinson, and Menominee continue to observe Central Time.

IANA time zone database

The zone for Michigan as given by

zone.tab This is a list of time zones from release of the tz database. Legend Type * Canonical - The primary, preferred zone name. * Link - An alternative name (alias) which links to a canonical zone. * Link - A standard Link (as above). The dagger symb ...

of the

IANA time zone database The tz database is a collaborative compilation of information about the world's time zones, primarily intended for use with computer programs and operating systems. Paul Eggert is its current editor and maintainer, with the organizational backi ...

History

IANA time zone database

References

See also