Javascript new Date(), compare confuse [duplicate]

Question

Can anyone explain this unexpected behavior?

console.log(new Date() == new Date()); // false
console.log(new Date() >= new Date()); // true
console.log(new Date() <= new Date()); // true

Answer 1

The == comparator compares the object references, and two different objects will never be equal.

The relational comparators, however, will compare the numeric values of the dates (the underlying timestamps). Thus if you tried

new Date().getTime() == new Date().getTime()

you'd get true. In this case, the = part of the >= and <= operators makes the statements true (as in the example above).

Answer 2

The first is comparing equality of 2 different objects.

The >= and <= will first coerce the Date objects to Number

Simplified resultant example:

{} == {} // false    
41765490 <= 41765490 // true
41765490 >= 41765490 // true

For the first case of == you can also force the coersion to number doing:

+new Date() == +new Date() // true (assuming no lag between creating both)