Whats is difference between priority date and received date?

The received date is generally the date that the USCIS cashier registers the fee acceptance. The priority date is the date that the application or petition was stamped into the mailroom at USCIS. The priority date is the earlier of the two. Your case sounds unusual in that you are saying that the receipt date was approximately two years after the priority date was assigned. I suggest that you reach out to the contact center of USCIS at 1-800-375-5283 to discuss your situation and have the agency look into it if what you are saying is correct. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (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.