because thats the way you speak it.
"Today is January 12th, 2012"
you could say "today is the 12th of January, 2012" but then you would sound like a pompous British dipshit.
"Two words would be like pow and fun. fun pow.. FUNPOW" Sean Pettit
ďThis life I am living, what I do everyday, I mean itís unreal, Itís every single day I ski, every single day I Iím out in the mountains with my friends, I love so much, Itís like the righteous day, the fullest day, itís every day man, it is an absolute blessing to be doing what Iím doing and never will I take it for grantedĒ - CRJ