1 Pa.C.S. § 1908

When any period of time is referred to in any statute, such period in all cases, except as otherwise provided in section 1909 of this title (relating to publication for successive weeks) and section 1910 of this title (relating to computation of months) shall be so computed as to exclude the first and include the last day of such period. Whenever the last day of any such period shall fall on Saturday or Sunday, or on any day made a legal holiday by the laws of this Commonwealth or of the United States, such day shall be omitted from the computation.