Who originally wrote "Closing Time", Green Day or Semisonic?

Semisonic Drummer Jake: He says singer Dan Wilson wrote the song when he was about to become a father, and the song is also about "getting kicked out of the womb" -- being born. A further examination of the lyrics suggests he might not be kidding:

Closing time--Time for you to go out to the places you will be from Closing time This room won't be open till your brothers or your sisters come

http://foodisworse.typepad.com/this/2004/08/closing_time.html