Compare two date object in angular 4

Question

I tried to compare two date objects in angular 4 but it always returning false

below are my code snippet

CheckForHoliday(d: Date) {
  let simpleDate = new Date(d.getFullYear(), d.getMonth(), d.getDay());
  let hDate = new Date(2018, 9, 1);
  console.log(simpleDate + "==========" + hDate);
  console.log(hDate === simpleDate);

  return (hDate === simpleDate);
}

The output is as below

Mon Oct 01 2018 00:00:00 GMT+0530 (India Standard Time)==========Mon Oct 01 2018 00:00:00 GMT+0530 (India Standard Time)

false

Any Idea why it returning false when the printed values look same?

Include MomentJS into your application if you can and use the isSame function to compare. — Ronald91, Oct 19 '18 at 13:09

score 1 · Answer 1 · answered Oct 19 '18 at 13:06

1

You could do a date.getTime() and then compare the two numbers

answered Oct 19 '18 at 13:06

mak15

367
2
12

score 0 · Answer 2 · answered Oct 19 '18 at 13:07

0

You should compare the dates in the date Objects. If you call the getDate() method on the date Objects you will get true.

hDate.getDate() === simpleDate.getDate() //=> returns true

answered Oct 19 '18 at 13:07

Rob Rombouts

88
9

1

That's incorrect. [`Date.getDate()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getDate) returns the day of the month. – Jeto Oct 19 '18 at 13:08
Indeed missed that, my bad, Date.toString() or Date.getTime() should do the trick; – Rob Rombouts Oct 19 '18 at 13:15
2

Yes or even better, `Date.getTime()` (no need to compare string representations when you can compare the inner timestamps). – Jeto Oct 19 '18 at 13:16

score 0 · Answer 3 · answered Oct 19 '18 at 13:07

new Date will return an object and you cannot compare objects like that. Try converting both of them to string before comparing them.

Do it like this

CheckForHoliday(d: Date) {
  let simpleDate = new Date(d.getFullYear(), d.getMonth(), d.getDay());
  let hDate = new Date(2018, 9, 1);
  console.log(simpleDate + "==========" + hDate);
  console.log(hDate === simpleDate);

  return (hDate.toString() === simpleDate.toString());
}

Compare two date object in angular 4

3 Answers3