25 Pa.C.S. § 3509: Timely casting of ballot.

To be valid:

(1) a military-overseas ballot must be received by the appropriate county election board not later than the close of the polls; or

(2) the voter must submit the ballot for mailing or other authorized means of delivery not later than 11:59 p.m. at the place where the voter completes the ballot on the date immediately preceding the date of the election.