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Date of Birth Validation

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<html>
<head>
<title>Age calculator</title>
<script>

const date1 = new Date('01/06/2022');
const date2 = new Date('01/06/1987');
const diffTime = Math.abs(dob - todate);
const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24));
console.log(diffTime + " milliseconds");
console.log(diffDays + " days");
alert(diffTime);
alert(diffDays);
if(diffDays > 12784 )
{
alert("You are not eligible");
}
else{
alert("You are Eligible");
}

</script>

<script>
function ageCalculator() {
var userinput = document.getElementById("DOB").value;
var dob = new Date(userinput);
if(userinput==null || userinput=='') {
document.getElementById("message").innerHTML = "**Choose a date please!";
return false;
} else {
var month_diff = Date.now() - dob.getTime();
var age_dt = new Date(month_diff);
var year = age_dt.getUTCFullYear();
var age = Math.abs(year - 1970);
alert(document.getElementById("result").innerHTML =
"Age is: " + age + " years. ")
}
}
</script>

<script>
const _MS_PER_DAY = 1000 * 60 * 60 * 24;

// a and b are javascript Date objects
function dateDiffInDays(a, b) {
// Discard the time and time-zone information.
const utc1 = Date.UTC(a.getFullYear(), a.getMonth(), a.getDate());
const utc2 = Date.UTC(b.getFullYear(), b.getMonth(), b.getDate());

return Math.floor((utc2 - utc1) / _MS_PER_DAY);
}

// test it
const a = new Date("2017-01-01"),
b = new Date("2017-07-25"),
difference = dateDiffInDays(a, b);
</script>

<script>
var date1 = new Date("7/11/2010");
var date2 = new Date("8/11/2010");
var diffDays = parseInt((date2 - date1) / (1000 * 60 * 60 * 24), 10);

alert(diffDays )
</script>

</head>
<body>
<center>
<h2 style="color: 32A80F" align="center"> Calculate Age from Date of Birth <br> <br> </h2>
<b> Enter Date of Birth: <input type=date id = DOB> </b>
<span id = "message" style="color:red"> </span> <br><br>
<button type="submit" onclick = "ageCalculator()"> Calculate age </button> <br><br>
<h3 style="color:32A80F" id="result" align="center"></h3>
</center>
</body>
</html>

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Date of Birth Validation

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