73 Pa. Stat. § 1802
Where by any existing law or rule of court, or by any law or rule of court that may hereafter be enacted and made, the performance or doing of any act, duty, matter, payment or thing shall be ordered and directed, and where any court shall, by special or other order, direct the performance or doing of any act, matter, payment, sentence or decree, and the period of time or duration for the performance or doing thereof shall be prescribed and fixed, such time in all cases shall be so computed as to exclude the first, and include the last days of any such prescribed or fixed period, or duration of time: Provided, That 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: And provided, That this act shall not apply to the payment of negotiable paper.
73 P.S. § 1802