How to validate date through Jquery

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date validation through jquery......................


$("#Text3").datepicker({numberOfMonths:2,
     showButtonPanel: true,
     dateFormat:'dd/mm/yy',
     autoSize: true,
    
     maxDate: '+3m',
     Image:"image.axd.jpeg",
     showOn: 'both'
    
  
     });
     $("#button").click(function(){
     //alert("hello");
     var dateformat= document.getElementById("Text3");
     var splitvaue= dateformat.value.split('/');
    
     var date= new Date();
     alert(date.getMonth()+1);
    
    // if((parseInt(splitvaue[0])>=date.getDate())&&(parseInt(splitvaue[1]))>=(date.getMonth()+1)){
if(parseInt(splitvaue[1])<13 && parseInt(splitvaue[0])<=31){
    if(parseInt(splitvaue[2])==(date.getFullYear())) {
        alert("hello");
     }
}
     else
     {
     alert("should be enter Today Date");
     }
   
         });
     });

how to validate date in dd/mmm/yyyy format

this is simple validation in date format

function a(){
var i=document.getElementById("t1").value;

if(abc(i)){
alert("valid")}
else
{
alert("not valid");
}
}
function abc(output){
var i=output;
var reg= new RegExp("^([0][1-9]|[1-2][0-9]|[3][0-1])/(jan|JAN|Jan|feb|Feb|FEB|mar|Mar|MAR|apr|Apr|APR|may|May|MAY|May|Jun|jun|JUN|jul|JUL|Aug|aug|AUG|Sep|sep|SEP|Oct|oct|OCT|nov|Nov|NOV|dec|DEC|Dec)/([1-9][0-9][0-9][0-9])");
//document.write(i);
return reg.test(i);
//if(i=="")
//alert("blank");
}
 </script>