53 Pa. Stat. § 13347
Every city of the first class shall allow and permit every member of such police department to have at least twenty-four consecutive hours of rest in every calendar week, and shall rotate the members of the police department on a regular schedule, except in emergency cases for the suppression of riots or tumults or in times of war, pestilence, conflagration, or public celebrations, without diminution of the salary or compensation fixed by ordinance or resolution of such city: Provided, however, That no vacation or suspension period of a member of the police department shall be increased or reduced by reason of the fact that, during such period, such member, if working, would have been entitled to one or more rest days under the provisions of this act.
53 P.S. § 13347