Formatting DateTime object, respecting Locale::getDefault()

I have a DateTime object which I'm currently formating via $mytime->format("D d.m.Y") Which gives me exactly the format I need: Tue 5.3.2012 The only missing point is the correct language. I need German translation of Tue (Tuesday), which is Die (Dienstag). This gives me the right locale setting Locale::getDefault() But I don't know how to tell DateTime::format to use it. Isn't there a way to do s

[Chisei]

曜日のローカライズをスマートに出来そう。