Why is it called after dark when it is really after light?

Today i was with my boyfriend almost all day =) it was insanley great!
Last night we went to a show .. Ashes last show for a while since they are all back at college now it was a pretty good show. they were amazing .
Today we went roller blading for a while, and i didnt do too bad!! (yay for kaitie) and then we went out to eat.. olive garden <3>
<3>