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copied!<p>I made a new code myself. It is working on OnClick of submit button too, but the purpose of highlighting it achieved.</p> <pre><code><!DOCTYPE html> <html> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> <title>Untitled 1</title> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script> <script> $(function() { $('#btnSubmit').bind('click', function(){ var txtVal = $('#txtDate').val(); if(isDate(txtVal)) $('#txtDate').removeClass('highlight'); else $('#txtDate').addClass('highlight'); }); function isDate(txtDate) { var currVal = txtDate; if(currVal == '') return false; var rxDatePattern = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/; //Declare Regex var dtArray = currVal.match(rxDatePattern); // is format OK? if (dtArray == null) return false; //Checks for dd/mm/yyyy format. dtDay = dtArray[1]; dtMonth= dtArray[3]; dtYear = dtArray[5]; if (dtDay < 1 || dtDay > 31) return false; else if (dtMonth < 1 || dtMonth> 12) return false; else if ((dtMonth==4 || dtMonth==6 || dtMonth==9 || dtMonth==11) && dtDay ==31) return false; else if (dtMonth == 2) { var isleap = (dtYear % 4 == 0 && (dtYear % 100 != 0 || dtYear % 400 == 0)); if (dtDay> 29 || (dtDay ==29 && !isleap)) return false; } return true; } }); </script> <style> .highlight { background-color:#FFE6E7; } </style> </head> <body> <br/><br/> Date : <input type="text" id="txtDate" /> (dd/mm/yyyy) <br/><br/> <input type="button" value="ValidateDate" id="btnSubmit"/> </body> </html> </code></pre>

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