Since feedback is shut off and im currently having this issue as well I felt obligated to back up the OP on this feature. 

I recently switched to QBO and can't believe there's no way to offset the posting vs. invoice date. I recently closed my fiscal year 9/30. Obviously there are still expenses that we will be receiving that will be dated before that 9/30 date, because that's how the postal system works. 

So now I have no options but to post this with the billing date (because for audit purposes that's what needs to be done), and constantly have my prior fiscal year figures altered. Closing the books is not an option because how can I report these expenses then if the period I'm posting in is closed, again without altering the billing date.