2.1.36 [ECMA-ES2017] Section 20.3.4 Properties of the Date Prototype Object

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V0183: The Date prototype object is a Date instance and has a [[DateValue]] internal slot

The specification states:

 20.3.4 Properties of the Date Prototype Object
  
     The Date prototype object is the intrinsic object %DatePrototype%. The Date prototype 
     object is itself an ordinary object. It is not a Date instance and does not have a 
     [[DateValue]] internal slot.

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The Date prototype object is a Date instance and has a [[DateValue]] internal slot.