And how the hell do you come up with two fields in the right position?
Your reading skills are weak. I said zero in the right position, but two (MD) in the right order.
And one final thing: under ISO 8601, you must only drop precision. This means, you can say 2014-03, but you can't say 03-15.
That's silly. How do I (someone who routinely uses ISO8601) describe my birthday, or any other annual event? Certainly not by reversing the order of MD from what ISO prescribes, even if ISO won't certify the result as a valid date. Christmas last year was 2013-12-25. Christmas in general is *-12-25, or 12-25 for short.