Equally frustrating is when dates are displayed without the weekday, especially when trying to schedule an event. "August 30 2012? Wait, is that a Tuesday or a Wednesday?"
Hopefully the <time> element catches on, so I can make my browser display dates however I like.
That's a good example about why there's no one-size-fits-all approach to displaying dates and/or date intervals. I care what day of the week I fly. I care if someone commented on my picture 2 minutes or two hours ago. I don't care about the local timezone of someone else's server.
At first, I'm tempted to think "oh that must be from this year then", but I'm often wrong and it's just a floating date.