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How to check if a string is a date with jquery

How to analyze if a string is a valid date. I tried everything on the Internet and nothing works. I know that the question is asked several times earlier, but even in threads that say they have solved the problem, does not work for me. I begin to ask myself if there is any way. I will send my code here. I have three text fields: one for a day, one for a month and a year, and to send the form I need to check if they form a valid date.

<html> <head> <title>Simple Form Validation</title> <script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript" src="http://dev.jquery.com/view/trunk/plugins/validate/jquery.validate.js"></script> <script type="text/javascript"> jQuery.validator.addMethod( "customDateValidator", function(value, element) { var concateDate; concateDate= $("#day").val() + "/" + $("#month").val() + "/" + $("#year").val(); var rslt= (Date.parseExact(concateDate, "d/M/yyyy") ); if(isNaN(rslt)) return false; else return true; }, "Please enter a valid date" ); </script> <script type="text/javascript"> $(document).ready(function() { $("#form1").validate({ rules: { year: { customDateValidator: true } }, messages: { year: "Please enter valid datum." } }); }); </script> </head> <body> <form id="form1" method="post" action=""> <div class="form-row"><span class="label">Day *</span><input type="text" name="day" id="day" /></div> <div class="form-row"><span class="label">Month *</span><input type="text" name="month" id="month" /></div> <div class="form-row"><span class="label">Year</span><input type="text" name="year" id="year" /></div> <div class="form-row"><input class="submit" type="submit" value="Submit"></div> </form> </body> </html>
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This is how I do it and it works well.

 rules: { month: { required: true }, day: { required: true }, year: { required: true, date_check: function(){ return $("#month").val()+'/'+$("#day").val()+'/'+$("#year").val() } } } jQuery.validator.addMethod("date_check",function(a,b,c){ month = c.substring(0,2)-1; day = c.substring(3,5); year = c.substring(6,10); mSeconds = (new Date(year, month, day)).getTime(); objDate = new Date(); objDate.setTime(mSeconds); if(objDate.getFullYear() != year || objDate.getMonth() != month || objDate.getDate() != day) { return false; } return true; }, "Please provide a valid date.");
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