Are you talking about some other answer from top one? The one that takes index of current month and prints it? That looks pretty straight forward to me.
Explicitly and manually creating a (mutable!) array of strings for this purpose is rather ridiculous. Contrast with the equivalent code in Go: http://play.golang.org/p/lpYeBYGEv5
It's especially ridiculous in Javascript because the internal functions make use of it (try calling (new Date()).toString()), but they don't give direct access to it.
A well-designed stdlib should handle all of these basic things without requiring the programmer to do any extra work. It's especially important when talking about time, because there are so many wacky edge cases that no programmer is ever going to be able to predict all of them if they have to roll it themselves.
