The Pennsylvania Superior Court has held that a clause requiring written notice of termination within sixty days is satisfied by notice received two days beyond termination date.
Music, Inc. v. Henry B. Klein Co., 213 Pa. Super. 182, 245 A.2d 650 (1968).
Charles J. Romito,
Contracts - Reservation of Power to Terminate Existing Contract,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol7/iss2/11