Why does Chrome Dev Tool show a dates proto as Invalid Date?

"I'm still curious as to what it means when it says Invalid Date"

That's simply the toString value of the prototype object of the Date constructor function.

Date.prototype.toString(); // "Invalid Date"

You can override it if you like...

Date.prototype.toString = function() { return "I like turtles." };

var myDate = new Date(1331869050000);
myDate.__proto__; // I like turtles.

A little off topic, but __proto__ is in the current working draft for the next version of ECMAScript, codename Harmony.

http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts

Added section B.3.1 with specifies __proto__ feature.

considering you made a new Date object, I wouldn't worry about it. The reason being, if you try this code:

var myDate = new Date(1331869050000);
alert(typeof myDate.getMonth != 'undefined')    //true

This will determine that you are inheriting the Date objects methods and that in fact, Date IS defined.

If you would like further investigation, take a look at this post.

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