Time in Michigan
All counties in Michigan's Lower Peninsula observe Eastern Time, as do most counties in the state's Upper Peninsula. The U.P. counties that do not, the four counties which have a land border with 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 counties of Gogebic, Iron, Dickinson, and Menominee continue to observe Central Time.
IANA time zone database
|c.c.||coordinates||TZ||comments||UTC offset||UTC offset DST||Note|
|US||+421953-0830245||America/Detroit||Eastern Time - Michigan - most locations||−05:00||−04:00|
|US||+450628-0873651||America/Menominee||Central Time - Michigan - Dickinson, Gogebic, Iron & Menominee Counties||−06:00||−05:00||Was used statewide from January 1, 1905 until May 15, 1915. This was prior to the advent of DST, so UTC-6 was used all year long|