Midnight deadline is not based on when you receive a return, it's based on when the drawee bank submits the return. (Depending on how many coorspondant banks there are between the drawee bank and you rhe return time will vary.)
Since 3/1/13 was a Friday, the drawee bank would have until midnight the next business day to submit the return which would be midnight Monday 3/4/13. When you receive it would be based on the return path it takes.
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