It returns a new datetime object which includes its own validity check and raises an exception for a bad leap day the same way it would for March 32nd or Blurns

It returns a new datetime object which includes its own validity check and raises an exception for a bad leap day the same way it would for March 32nd or Blurnsuary 12th. (However, year must be an integer in [1, 9999].) Edit: So, another leap year would be fine.