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Eastern Standard Time - is abbreviated as EST. Eastern Daylight Time- is abbreviated as EDT. Southeast, Michigan is GMT/UTC - 5h during Standard Time. Southeast, Michigan is GMT/UTC - 4h during Daylight Saving Time.
This is a list of telephone area codes in the state of Michigan: 1  231 - Northwestern Lower Michigan: Traverse City, Ludington, Muskegon, Petoskey and Cheboygan. 2  248 - Northern Metro Detroit: All of Oakland County, Northville, and most of Northville Township; overlays with area code 947.