What's wrong with January 5th?

[Made In Quebec]

Can someone explain this phenomenon

All these persons, were born on Jan 5th. What are the odds? Not to mention they are all from Australia & New Zealand, which makes it even weirder

[Calvin]

dont know but 9 month before is april 5th, so maybe some thing to do with easter?
seasons are backwards too, so it's like autumn/winter there.

still, at least now you know when to plan your holidays