While some sources list December 1st as well as February 29th as the “official” date (depending on which universe and/or revamp you’re considering), many consider June 18th as the birthday of Clark Kent (aka Kal-El of Krypton, aka Superman).

The date is when Martha and Jonathan Kent discovered the rocket containing baby Kal-El; the child was adopted and raised by them.

June 18th is also the birthdate of Bud Collyer (June 18, 1908 – September 08, 1969), who voiced Superman/Clark Kent during the radio series of the 1940’s.