Check if the given string is a date object

Question

I need to check whether the given string is date object or not.

Initially I used

 Date.parse(val)

If you check Date.parse("07/28/2014 11:23:29 AM"), it'll work.
But if you check Date.parse("hi there 1"), it'll work too, which shouldn't.

So I changed my logic to

val instanceof Date

But for my above date string, "07/28/2014 11:23:29 AM" instanceof Date it returns false.

So, is there any way with which I can appropriately validate my string against Date?

try to replace date string `07/28/2014 11:23:29 AM` to `29-07-2014 11:23:29 AM` — Satish Sharma, Jul 28 '14 at 06:30

score 11 · Answer 1 · edited Jul 28 '14 at 07:19

11

You can use Date.parse to check if it is a date or not using below code. Date.parse() return number if valid date otherwise 'NaN' -

var date = Date.parse(val);
if(isNaN(date))
 alert('This is not date');
else
 alert('This is date object');

For more information - Date Parse()

edited Jul 28 '14 at 07:19

answered Jul 28 '14 at 06:32

Bhushan Kawadkar

3

isNaN(Date.parse("hi there 1")) returns `false`! – PrashantJ Jul 28 '14 at 06:39
Yes it is return false because `hmm 1` is taking as hour minute formate string and `Date.parse` is converting it to date number. This case also fails with `new Date(val)` for which you accepted answer, see [this](http://jsfiddle.net/E6t4L/8/) – Bhushan Kawadkar Jul 28 '14 at 07:03
2

won't a number return a number though? "89" is not a date – deebs Apr 22 '16 at 18:51

score 2 · Answer 2 · edited Jul 28 '14 at 06:51

2

function isDate(val) {
    var d = new Date(val);
    return !isNaN(d.valueOf());
}

Hope helps you

edited Jul 28 '14 at 06:51

jgillich

answered Jul 28 '14 at 06:30

Neeraj Dubey

@PrashantJ Can you explain why unmark the answer as accept.Is it not working or something else. – Neeraj Dubey Jul 31 '14 at 11:50
6

`!isNaN(new Date("Hacker%1337"))` returns `true` – Motomotes May 06 '15 at 19:17

2 Answers2