(a) When any period of time is referred to in this chapter, the period of time in all cases shall be so computed as to exclude the first and include the last day of the specified period of time. Whenever the last day of a specified period of time shall fall on Saturday, Sunday or a legal holiday under the laws of the Commonwealth or the United States, the last day shall be omitted from the computation.
(b) Subsection (a) supersedes 1 Pa. Code § 31.12 (relating to computation of time).