但是，我有一定依據！請英文較好的朋友說出自己的理解。

我早在7月20日就對RD是寄件還是收件日期有疑惑，請先了解一下我當時的困惑，7月20日我的原帖在此：肯定是8月17日為截止日，當問題在於：究竟是寄出截止日還是

七月份移民局的更正通知原文摘錄如下：
USCIS Announces Revised Processing Procedures for
Adjustment of Status Applications
WASHINGTON—U.S. Citizenship and Immigration Services (USCIS) announced that,
beginning immediately, it will accept employment-based applications to adjust status (Form I-
485) filed by aliens whose priority dates are current under the July Visa Bulletin, No. 107.
USCIS will accept applications filed not later than August 17, 2007.
我連托福還沒敢去考，所以請高手們幫忙翻譯最後一句，到底filed not later than 的準確含義是什麽？