Question

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

I get a weird message when I look up the prototype of the Date object:

Date.prototype; // Invalid Date

This is strange; why am I not getting the object from the prototype of Date as expected? Furthermore, the message that it returns is a string, but typeof(Date.prototype) returns “object”. I also find that peculiar. Why am I getting this output?

Answer 1

15.9.5 Properties of the Date Prototype Object

The Date prototype object is itself a Date object (its [[Class]] is "Date") whose
[[PrimitiveValue]] is NaN.

NaN is what’s happening