The time in which any act provided by law is to be done is computed by excluding the first day and including the last unless the last day is a holiday, and then it is also excluded.
Mont. Code Ann. § 1-1-306
Computation of time -- which days counted
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.