With all due respect to Tim, this is a PA contract. In PA the standard form contract is a "Time is of the Essence" contract. Dates are set and can not be changed unless agreed to in writing buy both buyer and seller. Going beyond the closing date is not normal here without a written extension. Contact your agent and get a signed extension NOW. You are out of contract.
Fran and Mark Redding
Prudential Fox Roach
1010 Stony Hill Road
If there is a clause that says, "Time is of the essence" then that is a drop dead date and the contract could die if it is passed. We don't often like to use that term because it is better to delay a few days than to start all over again. If that term is used in the closing date clause, then you will need to sign an extension.