The passport is not going to prove that you were here on June 15 unless it was issued to you by a consulate in the US on or about June 15th. You need documents showing you were in the US on or about June 15th.
You should retain an experienced immigration lawyer to review all the facts, advise you, and handle the case. You can find one through http://www.ailalawyer.com.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
If you are talking about June 15, 2012 and August 15, 2012, show your school records up to March 2012 and as many other things as you can find as near to June as possible - even if it is August 2012. Have you been in and out of the U.S. a lot? If never, then submit what you have along with some affidavits and wait to see if USCIS asks you for more evidence.
Andrew M. Bramante, Rosner Partners, 216-771-5588. Free telephone consultation. You should always consult with an experienced immigration attorney to make certain that the advice you received is appropriate for your particular immigration case.
Try to find whatever you can - receipts, notices etc. A signed letter may also work, if you can't find anything else.
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What about phone or utility bills or leases?
Ellie Mosko Attorney Ellis Porter, PLC 2701 Troy Center Dr., 410 Troy, MI 48084 Phone: 248-519-9900 Fax: 248-519-9901 Email: firstname.lastname@example.org The information I provide on Avvo is for informational purposes only and does not constitute legal advice or create an attorney client relationship