I think the "This posted was edited on this date and time" should be at the top of every post rather than the bottom. Because if it's at the bottom, hardly anyone's going to pay any attention to that even when going through already read posts. With it at the top, it will be the first thing we will see and if we read it in the past, we can carefully look at it again.
Do you really need to know that someone edited the post that bad? Its at the bottom for reference, not for importance.
Well, it's important sometimes becuase often instead of creating a new post the starter of a topic will edit their original post to include something new/ more info. If this is the case it can often be missed. other then that i dont think it's that important to know when the post was edited.