Mich. Ct. R. 1.108

As amended through April 3, 2024
Rule 1.108 - Computation of Time

In computing a period of time prescribed or allowed by these rules, by court order, or by statute, the following rules apply:

(1) The day of the act, event, or default after which the designated period of time begins to run is not included. The last day of the period is included, unless it is a Saturday, Sunday, legal holiday, or day on which the court is closed pursuant to court order; in that event the period runs until the end of the next day that is not a Saturday, Sunday, legal holiday, or day on which the court is closed pursuant to court order.
(2) If a period is measured by a number of weeks, the last day of the period is the same day of the week as the day on which the period began.
(3) If a period is measured by months or years, the last day of the period is the same day of the month as the day on which the period began. If what would otherwise be the final month does not include that day, the last day of the period is the last day of that month. For example, "2 months" after January 31 is March 31, and "3 months" after January 31 is April 30.

Mich. Ct. R. 1.108