I always thought Clark's birthday was February 28, though I knew in the show he was found on May 17. I assumed it was one of those things you just accept without an explanation. laugh

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We don't know Lois's birthday -- I think we heard her astrological sign in one of the eps, but I can't remember what it was.
It was Libra, I recall Lois telling Star when she unsuccessfully tried to guess her astrological sign. I think it was in Contact, but I'm not sure.

Julie

Mulder: Imagine if you could come back and take out five people who had caused you to suffer. Who would they be?
Scully: I only get five?
Mulder: I remembered your birthday this year, didn't I, Scully?

(The X-Files)