Regular Expression to validate a timestamp

Question

I need a regular expression to validate a timestamp of the format, using Javascript:

YYYY/MM/DD HH:MI:SS

I trie

Answer 1

function isTimestamp($input){
            var $regex = /^\d\d\d\d-(0?[1-9]|1[0-2])-(0?[1-9]|[12][0-9]|3[01]) (00|[0-9]|1[0-9]|2[0-3]):([0-9]|[0-5][0-9]):([0-9]|[0-5][0-9])$/;
            return $regex.test($input);
        }

check please