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

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“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.

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