Well, it is an American based site for an American based game.
imo, the date format is based on what's needed to find that date (like on a calendar). Year is least important because you should damn well know what year it currently is, but it's still given at the end just for clarification or for dates further off in the past/future. But to find the date of 9-7, first you have to turn the calendar to September (9) and then find the date of the 7th.
As for time... you have that format incorrect, haste. It is big to small. hh:mm:ss. We just use a 12-hr date format instead of 24-hr (though the military uses 24-hr time), because a clock only has 12 hours on it.