Cheers442: Unfortunately, no. In NJ, the closing date is "on or about," needed because attorneys, often involved here, need the flexibility of answer court calls, etc. The normally used contract does not have a "date fixed, time certain" closing. Since we hear that at least some lenders involved in short sales are not very responsive, they can delay the closing for months at a time. The other timed dates in the contract still stand, such as the time for inspection. They are spelled out and fixed.
What any short sale buyer (and seller) needs, is an addendum to the contract for short sales. Our office has generated one but not all Realtors have been as diligent. You might well have your attorney generate such an addendum, if you are not already under contract and if you are, I believe that the appropriate procedure would be to have a "Time of the Essence" letter sent. This gives notice that, after a reasonable time for the other party to get organized, they must appear, ready to close, as stated. Otherwise, they will be in default and would bear the consequences for default. This might mean more than just a return of your deposit and the voiding of the contract but that would be a legal matter and to get advice on the subject, you must consult legal counsel, not a Realtor.
Best of luck.