UCICS sent Notice for Approval, after end date.

As USCIS sent you the approval notice after the time has expired of your request to stay, USCIS expects that you will leave as soon as possible. There is no grace period of time. However, no one will be coming to chase you out of the country. You should also have no problems leaving the country. The principal thing to watch out for is the unlawful presence bar under which a person who stays in the US for more than 180 days after date of expiration is generally barred from returning for three years. Applicants for timely extensions are allowed to wait in the US until the time of their adjudications, which in your case was up until October 17. October 18 would begin the counting as day 1 of the 180 days. Due to the limitations of the Lawyers.com Forums, Alan Lee & Arthur Lee, Esqs.’ (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.