No. The closing date is a contract term, and one side cannot move it alone. If you do not close on time you are technically out of contract, and moving the date takes either a negotiated new date or the seller's cooperation on an extension. Neither happens because the buyer decided it should. In practice, the common pattern runs closer to asking forgiveness than asking permission. A short delay everyone can see coming, with a cooperative seller, usually gets tolerated, especially when the buyer and their team keep the seller informed the whole way. We have kept deals alive well past the original date, including one that closed weeks late because a lender was slow delivering a sizable buyer credit. Constant communication with the seller held that one together. Deals do die over late closings, though never yet on one of ours, and the difference is almost always communication and good faith. If you are going to be late, flag it early, explain why, and give the seller a reason to work with you. A blindsided seller is far more likely to walk or demand concessions than one who has been in the loop from the first sign of trouble.