Title: Time in Michigan
Content:  Before time zones were introduced, every place used local observation of the sun to set their clocks, which means they used local mean time, 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 came into effect, the Upper Peninsula went under year-round CST, with no daylight saving time. In 1973, the majority of the peninsula switched to Eastern Time; only the four western counties of Gogebic, Iron, Dickinson, and Menominee continue to observe Central Time.
Title: Time in Michigan
Content:  Michigan observes Eastern Time, except for four counties and two cities, which observe Central Time.
Title: Upper Peninsula of Michigan
Content:  Like the entire Lower Peninsula, most of the Upper Peninsula observes Eastern Time. However, the four counties bordering Wisconsin are in the Central Time zone. In 1967, when the Uniform Time Act came into effect, the Upper Peninsula went under year-round CST, with no daylight saving time. In 1973, the majority of the peninsula switched to Eastern Time; only the four western border counties of Gogebic, Iron, Dickinson, and Menominee continue to observe Central Time. Daylight saving time is observed peninsula-wide.
Title: Time in Michigan
Content:  The zone for Michigan as given by zone.tab of the IANA time zone database
Title: Daylight saving time in the United States
Content:  In 1967, the Michigan Legislature adopted a statute, Act 6 of the Public Acts of 1967, exempting the state from the observance of DST. The exemption statute was suspended on June 14, 1967, however, when the referendum was invoked. From June 14, 1967, until the last Sunday in October 1967, Michigan observed DST, and did so in 1968 as well. The exemption statute was submitted to the voters at the General Election held in November 1968, and, in a close vote, the exemption statute was sustained. As a result, Michigan did not observe DST between 1969 and 1972. Radio station CKLW in Windsor, Ontario, across the river from Detroit, was popular on both sides of the border and as a result would often give both times on the air (e.g., "It's 4:30 in Detroit and 5:30 in Windsor"). In November 1972, an initiative measure, repealing the exemption statute, was approved by the voters. Michigan again observed DST in 1973 and has continued to do so since then. The vast majority of Michigan is in the Eastern Time Zone. Only the Upper Peninsula counties that border Wisconsin (Gogebic, Iron, Dickinson, and Menominee) are in the Central Time Zone.
Title: Standard time in the United States
Content:  In summer 1960 April–October Daylight Time was nearly universal in Pennsylvania, Maryland, Delaware and states east and north of there. In Minnesota, Iowa, Missouri, Kentucky and Virginia and states north and east of there, some areas had it and some did not. Except for California and Nevada, which had April-Sept Daylight Time, 99% of the rest of the country used Standard Time year-round. (The Official Guide says "State law prohibits the observance of "Daylight Saving" time in Kentucky but Anchorage, Louisville and Shelbyville will advance their clocks one hour from Central Standard time for the period April 24 to October 29, inclusive.") In the middle 1960s the airline and other transportation industries lobbied for uniformity of Daylight dates in the United States.
Title: Time in Maine
Content:  Time in Maine, as in all US states, is regulated by the United States Department of Transportation. All of Maine is in the Eastern Time Zone (ET) and observes daylight saving time (DST). Eastern Maine has the earliest solar noon of the contiguous United States, and the portion of the state that is east of 67.5°W longitude is geographically in the Atlantic Time Zone, which is used by adjacent New Brunswick, Canada. Independent of daylight saving time, solar noon at the March equinox is approximately 11:50 in the southwestern part of the state, and 11:35 at West Quoddy Head Light, the easternmost point of the contiguous United States.  During winter, sunset can occur in some areas as early as 3:42 p.m. Most of the New England states have considered using the Atlantic Time Zone without daylight saving to mitigate this. In 2005, the Maine Legislature considered switching the entire state to Atlantic Standard Time all year long and eliminating daylight saving time. The bill did not pass.
Title: Central Time Zone
Content:  In those areas of the Canadian and American time zones that observe DST, beginning in 2007, the local time changes at 02:00 local standard time to 03:00 local daylight time on the second Sunday in March and returns at 02:00 local daylight time to 01:00 local standard time on the first Sunday in November. Mexico decided not to go along with this change and observes their horario de verano from the first Sunday in April to the last Sunday in October. In December 2009, the Mexican Congress allowed ten border cities, eight of which are in states that observe Central Time, to adopt the U.S. daylight time schedule effective in 2010.
Title: Outline of Michigan
Content: Regions in which Michigan is located: ; Northern hemisphere ; Western hemisphere ; Americas ; North America ; Anglo America ; Northern America ; United States of America ; Contiguous United States ; Central United States ; Corn Belt ; East North Central States ; Midwestern United States ; Great Lakes Region ; Located next to: ; Adjacent states ; Illinois ; Indiana ; Minnesota ; Ohio ; Wisconsin ; Adjacent Canadian province ; Ontario ; Time zones: ; Eastern (UTC-5/-4), 79 of 83 counties ; Central (UTC−6/-5), 4 western U.P. counties Location: 41° 41' N to 48° 18' N latitude, 82° 7' W to 90° 25' W longitude
Title: Michigan
Content:  and the upper peninsula average almost 160 in of snowfall per year. Michigan's highest recorded temperature is 112 F at Mio on July 13, 1936, and the coldest recorded temperature is -51 F at Vanderbilt on February 9, 1934. The state averages 30 days of thunderstorm activity per year. These can be severe, especially in the southern part of the state. The state averages 17 tornadoes per year, which are more common in the state's extreme southern section. Portions of the southern border have been almost as vulnerable historically as states further west and in Tornado Alley. For this reason, many communities in the very southern portions of the state have tornado sirens to warn residents of approaching tornadoes. Farther north, in Central Michigan, Northern Michigan, and the Upper Peninsula, tornadoes are rare.

Question: what standard time is michigan?
Answer: Central Time Zone.