While most of Michigan is in the Eastern Time Zone, four counties on the western end of the Upper Peninsula are not. Dickinson, Gogebic, Iron, and Menominee counties are bordered by Wisconsin, which is in the central time zone. Michigan observes Eastern Time, except for four counties and two cities, which observe Central Time. The eastern part of Michigan is in the Eastern time zone of the United States.
Eastern Standard Time (EST) is 5 hours behind Greenwich Mean Time (GMT-).
Learn more about Troy, Michigan