How to check if a string is a legal “dd/mm/yyyy” date?

Question

Given a string str, how could I check if it is in the dd/mm/yyyy format and contains a legal date ?

Some examples:

bla bla          


        

Answer 1

Try -

   var strDate = '12/03/2011';
   var dateParts = strDate.split("/");
   var date = new Date(dateParts[2], (dateParts[1] - 1) ,dateParts[0]);

There's more info in this question - Parse DateTime string in JavaScript (the code in my answer is heavily influenced by linked question)

Demo - http://jsfiddle.net/xW2p8/

EDIT

Updated answer, try -

function isValidDate(strDate) {
    if (strDate.length != 10) return false;
    var dateParts = strDate.split("/");
    var date = new Date(dateParts[2], (dateParts[1] - 1), dateParts[0]);
    if (date.getDate() == dateParts[0] && date.getMonth() == (dateParts[1] - 1) && date.getFullYear() == dateParts[2]) {
        return true;
    }
    else return false;
}

This function passes all the test cases. As far as I'm aware, Adam Jurczyk had posted an accurate answer well before I corrected my original wrong answer. He deserves credit for this.

Demo - http://jsfiddle.net/2r6eX/1/