When is Superman's birthday?

Answer 1

If you want to get technical, it is impossible to know Kal-El's true date of birth since the Kryptonian calendar was destroyed with the planet, however, Action Comics #149 (Oct. 1950) gives October as Superman's birthdate. Comics of the 1960s through 1980s describe Superman's birthday as February 29.

Clark Kent, meanwhile, would celebrate his birthday on June 18, the date the Kents first found Clark.

Following the 1980s editorial-revamp DC called Crisis on Infinite Earths, Kent's birthday is given as February 29 & Superman: Secret Origin #1 (Nov. 2009) depicts Kent celebrating his birthday on December 1.