4.13.2014
There is no 13th month in 2014.
All kidding aside, if you want to be understood either use 2014-4-13 or 13 Apr 2014, both of which conform to international standards. Everything else is a local dialect.
Wow, that chart's "prediction" really sucks. According to that chart you should never ever buy bitcoin, because it just goes up too fast. In fact, everyone should just sell it all now. Did Barry Silbert give you that chart?