from Batman #320 (DC, February 1980), script by Denny O'Neil, pencils by Irv Novick, inks by Bob Smith, colors by Ben Oda, letters by Glynis Wein
Now, as we saw on
August 1...
from Super DC Calendar 1976 (DC, 1975), letters by Ben Osa
...the
Super DC Calendar '76, ordinarily the expert and definitive source for Pre-Crisis birth dates, lists August 1 as Joker's birthday. In a reverse of the way I usually run this blog (and if I can't contradict myself, who
can I contradict?) I'm gonna declare that August 1 is more definitive a birthdate than December 6, and that's because A)
The Joker lies and B) that December date is really just the fourth-wall breaking, real-world on-sale date of the next exciting issue of
Batman Comics & Stories. Well, you didn't expect them to hold this exciting story until
August came around again, did you?