Are you saying that because the edit day/time stamp is not dynamically generated, you can't adjust it for different time zones?
Clearly this isn't a life-threatening issue, but it seems inconsistent to me that the posting times are adjusted whereas the edit times are not. People not on the east coast who want to compare posting times and edit times may be misled. It might not be a bad idea to add "ET"/"EST"/"EDT" to the edit day/time stamp so that everthing is clear.