At 12:45pm EDT (GMT-4) I changed the status on one account. In the activities ATOM feed of another account it reported the status published/updated time to be "2009-07-07T00:44:46Z". The actual GMT timestamp it was submitted should be "2009-07-07T16:44:46Z" (12:44 - (-04:00) = 16:44).
The time being reported by the activities feed is 16 hours off from GMT.
The URI requested was /v1/users/77232795/friends/activities.atom?activityTypes=StatusMoodUpdate&dateFormat=utc
side note: this post was apparently published at 2pm, which would be correct in GMT-3, but it's one hour in the future for my geographical location. my post about incorrect timestamps appears to have an incorrect timestamp. :(