Date comparison

I'm surprised no one uncovered that here:

```js
new Date(10) == new Date(10) // false
new Date(10) < new Date(11) // true
new Date(11) > new Date(12) // false
new Date(11) > new Date(10) // true
```

Two object instances are always unequal. But they decided to overload operator `<` and `>` for `Date` and not `==`. This renders the whole thing useless.