In Javascript verify is var is valid datetime object

Question

I need to verify is var is valid datetime object. This

alert( "dat::"+( typeof dat ))

returns "object". Which is the valid way ?

Answer 1

Here is how I would do it:

if ( Object.prototype.toString.call(d) === "[object Date]" ) {
  // it is a date
}
else {
  // not a date
}

Answer 2

Use instanceof:

dat instanceof Date