Rules on Civil Procedure
Section 1. How to compute time. - In computing any period of time prescribed or allowed by these Rules, or by order of the court, or by any applicable statute, the day of the act or event from which the designated period of time begins to run is to be excluded and the date of performance included. If the last day of the period, as thus computed, falls on a Saturday a Sunday, or a legal holiday in the place where the court sits, the time shall not run until the next working day. (a)