Comparing two dates in jquery script

Question

I'm trying to compare two same dates in the browser console and getting the result as false. I don't understand how is it comparing as both the dates are the same?

$(function()
{
  var d1 = new Date("01-12-2001");
  var d2 = new Date("01-12-2001");
  
  console.log(d1 == d2);
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

but here if try to compare with GT and LT then its working.

"Working" depends on what you expect as the result. "01-12-2001" is not a format supported by ECMA-262, so parsing is implementation dependent. At least two current browsers will return an invalid date, — RobG, Jul 27 '19 at 11:14

fiveelements · Accepted Answer · 2019-08-04T11:19:57.917

5

It is checking for object equality. Compare the time instead.

$(function()
{
  var d1 = new Date("2001-12-01");
  var d2 = new Date("2001-12-01");
  
  console.log(d1.getTime() == d2.getTime());
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

edited Aug 04 '19 at 11:19

answered Jul 27 '19 at 08:21

fiveelements

3,649
1
17
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Except that in some browsers the result is `NaN == NaN` which is always false. – RobG Jul 27 '19 at 11:08
@RobG OP was comparing two Date objects and expecting true. That won't happen. The suggestion was to compare time. In some browser (IE is one of them) that date pattern is not recognized and hence you get NaN. Surely that has to be handled or the date format needs to be changed to an acceptable one. – fiveelements Jul 27 '19 at 11:13
This answer doesn't "work" in Safari or Firefox. It would help the OP to address the parsing issue in the same answer rather than letting them discover it later and have to ask another question. – RobG Jul 27 '19 at 11:19

Govind Sah · Answer 2 · 2019-07-27T13:56:02.703

3

Use numeric value corresponding to the time for the specified date according to universal time.

In your case use this

console.log((new Date("2001-12-01")).getTime() === (new Date("2001-12-01")).getTime());

Edit: The date format for parsing should be YYYY-MM-DD

edited Jul 27 '19 at 13:56

answered Jul 27 '19 at 08:27

Govind Sah

116
10

Which returns false in Safari and Firefox. – RobG Jul 27 '19 at 11:19
@RobG - Yes right, parsing date I missed that. – Govind Sah Jul 27 '19 at 13:52

score 0 · Answer 3 · answered Jul 27 '19 at 08:36

0

You need format new Date() to dateTime string first.

var d1 = new Date("01-12-2001");
var d2 = new Date("01-12-2001");

console.log(d1.toLocaleDateString() == d2.toLocaleDateString());

answered Jul 27 '19 at 08:36

Chando

424
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Comparing two dates in jquery script

3 Answers3