20000229  (y 2000 m 2 d 29) yep
19970229 nope
29020300 nope
291254  (y 1954 m 12 d 29) yep
002902  (y 1900 m 2 d 29) yep
19990223  (y 1999 m 2 d 23) yep
101172  (y 1972 m 10 d 11) yep