how to calculate age from date of birth in javascript – Calculate age from date of birth to current date. In our day to day programming we often come across business logic that depends on the age of a person.
how to calculate age from date of birth in javascript
i am going to see how to calculate the age of a person using their birth date as input in JavaScript Example with demo.
calculate age from date of birth in javascript
age calculator javascript
function calculate_age(dob) {
var diff_ms = Date.now() - dob.getTime();
var age_dt = new Date(diff_ms);
return Math.abs(age_dt.getUTCFullYear() - 1970);
}
console.log(calculate_age(new Date(1982, 11, 4)));
console.log(calculate_age(new Date(1962, 1, 1)));
Calculate age using JavaScript
Example 1: Predefined date input
<script>
var dob = new Date("06/24/2001");
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);
document.write("Age of the date entered: " + age + " years");
</script>
Example 2: dynamic date input
index.html
<html>
<head>
<script>
function ageCalculator() {
var memberIp = document.getElementById("DOB").value;
var dob = new Date(memberIp);
if(memberIp==null || memberIp=='') {
document.getElementById("message").innerHTML = "**Select 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);
return document.getElementById("result").innerHTML =
"Age is: " + age + " years. ";
}
}
</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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