Format date with moment js library

Question

I am trying to use moment js library in my GWT JSNI code:

public native String momentNow(String date) /*-{
    $wnd.console.log("Date: " + date);
    return $wnd.moment("YYYY-MM-DD HH:mm Z", date).format();
}-*/;

With a example input: 2014-02-04 07:47 +0800

But, what the method returns is "Invalid date" String. What could be wrong in my code?

Answer 1

Hmm... this is odd:

This works:

moment("YYYY-MM-DD HH:mm ZZ", moment().format("YYYY-MM-DD HH:mm ZZ"))
moment("YYYY-MM-DD HH:mm ZZ", "2014-02-04 07:47 +0800")
+moment("YYYY-MM-DD HH:mm ZZ", "2014-02-04 07:47 +0800")

But this doesn't work:

moment(
        "YYYY-MM-DD HH:mm ZZ", 
        moment().format("YYYY-MM-DD HH:mm ZZ")
      ).format()

And this works:

moment( +moment("YYYY-MM-DD HH:mm ZZ", "2014-02-04 07:47 +0800") ).format()

So is that a workaround?

Answer 2

You have the parameters in the wrong order. Per the documentation , the format string should be passed as the second parameter.

moment(date, "YYYY-MM-DD HH:mm Z").format()

However, since this format is one of the default ISO strings listed here , you can just omit it.

moment(date).format()