This guy single handedly caused a wave of unproductive cynicism with this stunt. It's like the joke about all the things an everything bagel doesn't have except essentially shitting on the hard work of the entire industry by making up endless nitpicks for laughs.
`Date` is based on the original Java `Date` class and its API was mostly copied verbatim, explaining a lot of the quirks and silliness. While JS can't remove things easily because that would break the web, a lot of work has gone into a set of time primitives that will effectively replace it. `Date`'s parsing logic is so bad even Java has deprecated it.
This is one of those cases where the problem isn't language design but boardroom politics - Sun wanted JS not to compete with Java so they had to try to make JS more like Java to present JS as a kind of "Java for amateurs".
Did you even read TFA? Tell me dates make even the faintest sense.