2.1.40 [ECMA-262/9:2018] Section 20.3.4 Properties of the Date Prototype Object

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%.
         • is itself an ordinary object.
         • is not a Date instance and does not have a [[DateValue]] internal slot.
         • has a [[Prototype]] internal slot whose value is the intrinsic object 
         %ObjectPrototype%.

EdgeHTML Mode

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