well, we not crystal ball readers. But border are open every day, so no reason for overstay. If you just needed to go Immigration (inside country) than on the 11th no overstay. But if you caught on street on the 10th you are done, arrested, fined, thrown in jail, IDC and deported.
since over one year the local Authorities and Embassies make it very difficult to obtain a ED Visa, even as a first timer. Again with so little information provided by OP it it a wide guess.