JavaScript validation for date return always false

Question

i am trying to validate date which Accept only dd/mm/yyyy.

i have use the following code to validate but it always show me alert.

what wrong with my code ??

when i used , var bevalue ='10/10/1989'; it work fine.

And in my code i used, value = $(this).val(); to get value.

then convert it to string

EDIT:

$('input, textarea').live('blur', function () {
        var field = $(this).attr('name');
        var value = $(this).val();

if(field=='birthday')
  {   
        var bevalue = String(value);   
        var regbday =/^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d+$/;
        if(regbday.test(bevalue) == false)
        {
            alert('please Enter Birth date in dd/mm/yyyy');
           return false;
        }
}

Thanks Everyone for reply my mistake in Regexp. I accepted answer.

What's this ? We need more code. And you should first debug to see what's value. — Denys Séguret
– Denys Séguret, Commented Mar 14, 2013 at 11:01
What dystroy is saying is that the code you've posted isn't the cause of the problem. As a side note, you should use ?: to prevent sub-expressions from being captured if you're not using them. — Andy E
– Andy E, Commented Mar 14, 2013 at 11:05
I tested it where value is fake and it works fine. Minus the fact that at the end you are capturing an unlimited amount of numbers +. So therefore I can enter in 10/10/12345679. Removing the + fixes that. if it isn't working, then value is wrong and to help we will need to understand how you are getting value's value like @dystroy said — Jeff Shaver
– Jeff Shaver, Commented Mar 14, 2013 at 11:12

Moritz Roessler · Accepted Answer · 2013-03-14 11:45:18Z

1

It's the regular expression that's not correct,

function checkBday(bevalue) {
    var regbday = /(0[1-9]|[12][0-9]|3[01])[\.\/\-](0[1-9]|1[012])[\.\/\-](19|20)\d\d/;
    if (regbday.test(bevalue) == false) {
        alert(bevalue + ' is not valid\nplease Enter Birth date in dd/mm/yyyy');
        return false;
    }
    return true
}
console.log(checkBday("14.03.2013")) //true
console.log(checkBday("14-03-2013")) //true
console.log(checkBday("14/03/2013")) //true
console.log(checkBday("14.03.12")) //false
console.log(checkBday("12.28.2013")) //false
console.log(checkBday(prompt("Enter Birthday in dd/mm/yyyy")));

This should work, heres an example on JSBIn

Edit
If you only want to match dates which use / as delimiter change the regexp to
/(0[1-9]|[12][0-9]|3[01])\/(0[1-9]|1[012])\/(19|20)\d\d/

edited Mar 14, 2013 at 11:45

answered Mar 14, 2013 at 11:29

Moritz Roessler

8,67329 silver badges57 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Moritz Roessler Over a year ago

I thought he is refereing to the format with dd/mm/yyyy and not to delimiter of the format, as he is matching against . / - in his regexp too

Jeff Shaver Over a year ago

I guess so. The question is worded odd. My bad.

Moritz Roessler Over a year ago

Nevermind =), i updated the answer anyway in case the op really only wants to match /

DocKuro · Accepted Answer · 2013-03-14 11:34:14Z

0

You have the wrong reg-exp, the day and month parts are switched and some characters are not escaped.

Use this formula:

var regbday = /^(0[1-9]|[12][0-9]|3[01])[\- \/\.](0[1-9]|1[012])[\- \/\.](19|20)\d\d+$/;

answered Mar 14, 2013 at 11:34

DocKuro

4444 silver badges13 bronze badges

Collectives™ on Stack Overflow

JavaScript validation for date return always false

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related