DateTime Validation in javascript

Question

I am new to javascript. I am fixing bug programmed by others. I see validation code in javascript as:

 function validateTime(str) {
    var pattern = new RegExp(/^(([0-9])|([0-1][0-9])|([2][0-3])):(([0-9])|([0-5][0-9]))$/);
    if (pattern.test(str)) {
        return true;
    }
    else {
        return false;
    }
}

But it does't validate time:- 22-05-2015

How can it be done?

It's not clear whether you are trying to validate a date or time: subject "*DateTIme*", function called "*validateTime*", text: "*…doesn't validate time*", example: "*22-05-2015*", which is a date. — RobG, May 18 '15 at 07:26
Possibly a duplicate of [*How to validate a date?*](http://stackoverflow.com/questions/5812220/how-to-validate-a-date), but maybe not… — RobG, May 18 '15 at 07:32

score 2 · Answer 1 · answered May 18 '15 at 07:26

2

You can use the Date object's parse method to verify a date string. You can then check if the value of Date.parse(str) is equal to "Invalid Date" to see if it is malformed. No need for regex at all.

answered May 18 '15 at 07:26

Trinick

21
3

1

That only works if the string is in a format that is correctly parsed by the Date function in the browser being used. Until ES5, that was entirely implementation dependent. Now it **should** work for ISO 8601 format dates, but doesn't necessarily. The format in the OP will be treated differently by current browsers in use. – RobG May 18 '15 at 07:28

n-dru · Answer 2 · 2015-05-18T07:30:06.873

1

Your regex validates time, not date. To check against date in your format, use this:

var pattern = new RegExp(/^(0[1-9]|[12][0-9]|3[01])-(0[1-9]|1[012])-(19|20)\d\d$/);

You can check this pattern here:

https://regex101.com/r/kB5nV2/1

edited May 18 '15 at 07:30

answered May 18 '15 at 07:21

n-dru

9,285
2
29
42

Thanks alot!! Worked perfectly!! – Prakash Rai - ITH May 18 '15 at 07:26
1

@AlfonsoGarnett thanks, Indeed I omitted that slash, already put it back in place. As to separator, I assumed OP wants exactly this format, sure it could be enhanced to capture even more formats. – n-dru May 18 '15 at 07:31
1

@n-dru, no problem, fair enough! Prakash, you should pick an answer if your problem is solved. – May 18 '15 at 07:52

score 0 · Answer 3 · answered May 18 '15 at 07:27

function parseDate(str) {
  var m = str.match(/^(\d{1,2})-(\d{1,2})-(\d{4})$/);
  return (m) ? new Date(m[3], m[2]-1, m[1]) : null;
}

The function validateTime(str) used in your code is for time validation. Try the parseDate(str) for date validation.

DateTime Validation in javascript

3 Answers3