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HTML and javascript code to calculate age

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The only known problem so far is that the IE (Internet Explorer) doesn't supports this coding.

<html>
    <head>
        <title>Age</title>
    </head>
    <body style="background-color: #294a8f; color: white;" onload="places();">
    <center>
        <h1>
Find Your Age!</h1>
<fieldset style="border-color: #2c4272; appearance: signature; border-style: outset; width: 210px;">
<legend style="text-align: center;">
                <input autofocus type="date" id="date" style="text-align: center; text-transform: capitalize;"/></legend>
            <button id="getAge" onclick="age();" style="color: white; background-color: #3b5998; border-color: #3b5998; appearance: push-button;"><b>Age!</b></button>
            <div id="age">
</div>
<div id="taken">
</div>
<footer style="font-size: xx-small;" onmouseover="mouseon();" id="note">(Note: The Date Format Should be 0MM-DD-YYYY. Example: 012-08-1997)</footer>
        </fieldset>
</center>
<div>
        <script>
            today=new Date();
            var current, current2, time;
            current=today.getDate();
            var id=document.getElementById('note');
            var val=id.innerHTML;
            function places(){
                place();
            }
            function place(){
                do{
                    var placeHolder=document.getElementById('date');
                    var tYear, tMonth, tDate, month;
                    tYear=today.getFullYear();
                    tMonth=today.getMonth();
                    tDate=today.getDate();
                    if (tMonth == 11) {
                        month = "Dec";
                    } else if (tMonth == 10) {
                        month = "Nov";
                    } else if (tMonth == 9) {
                        month = "Oct";
                    } else if (tMonth == 8) {
                        month = "Sep";
                    } else if (tMonth == 7) {
                        month = "Aug";
                    } else if (tMonth == 6) {
                        month = "Jul";
                    } else if (tMonth == 5) {
                        month = "Jun";
                    } else if (tMonth == 4) {
                        month = "May";
                    } else if (tMonth == 3) {
                        month = "Apr";
                    } else if (tMonth == 2) {
                        month = "Mar";
                    } else if (tMonth == 1) {
                        month = "Feb";
                    } else {
                        month = "Jan";
                    }
                    tMonth+=1;
                    if(tMonth>=10){
                        tMonth="0"+tMonth;
                    }
                    else{
                        tMonth="00"+tMonth;
                    }
                    today=new Date();
                    current2=today.getDate();
                    placeHolder.placeholder=month+"-"+tDate+"-"+tYear;
                    placeHolder.title="Your Date of Birth Required. (Note: If you wanna enter the date in number only, you have to do it as: "+tMonth+"-"+tDate+"-"+tYear;
                }while(current2>current);
            }
            function age(){
                setInterval(ages);
            }
            function ages(){
                var day1, month1, year1, day2, month2, year2;
                var age=document.getElementById("date");
                var temp;
                age=age.value;
                temp=age;
                date=new Date(age);
                today=new Date();
                year1=date.getFullYear();
                year2=today.getFullYear();
                day1=date.getDate();
                day2=today.getDate();
                month1=date.getMonth();
                month2=today.getMonth();
                age=year2-year1;
                if (month1> month2) {
                    age--;
                }
                if (month1==month2 && day1 > day2) {
                    age--;
                }
                if(age<0){
                    age=0;
                }
                if(isNaN(age)==true){
                    age="Invalid Date Of Birth! (Code: 001)";
                }
                else{
                    age+=" Years Old!";
                }
                if(year1>year2){
                    age="Invalid Date Of Birth! (Code: 002)";
                }
                else if(year1==year2 && month1>month2){
                    age="Invalid Date Of Birth! (Code: 003)";
                }
                else if(year1==year2 && month1==month2 && day1>day2){
                    age="Invalid Date Of Birth! (Code: 004)";
                }
                if(!(temp.length<=10)){
                    document.getElementById('age').innerHTML=age;
                    document.getElementById('getAge').disabled=true;
                    document.getElementById('taken').innerHTML="<font size='1'>"+date+"</font>";
                }
                else{
                    document.getElementById('getAge').disabled=false;
                }
            }
            function mouseon(){
                var size=2;
                time=10000;
                id.innerHTML='<font size=\''+(size)+'\'>'+val+'</font>';
                timeoutID=setInterval(mousedone, time);
               
            }
            function mousedone(){
                id.innerHTML='<font size=\'1\'>'+val+'</font>';
                clearTimeout(timeoutID);
                time=10000;
            }
        </script>
    </div>
</body>
</html>

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