Age Calculator using JavaScript

JavaScript Age Calculator – Solution: Age Calculator using JavaScript with source code, demo, and also how you can execute full program easily. To complete the program you need to follow those steps given bellow

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Description

Back to coding, To complete this program with debugging free code you have to create three files. The first file is to HTML and the second file gonna be CSS for design part and the third file JavaScript for function-related,

index.html

Create an HTML file named ‘index.html‘ and put those codes given below.

<!-- Coding Debugging (https://codingdebugging.com) -->
<!DOCTYPE html>
<html>
<head>
	<title>Age Calculator - Coding Debugging</title>

    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">

    <!-- Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.4.1.slim.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>

    <!-- Google Fonts -->
    <link href="https://fonts.googleapis.com/css2?family=Baloo+Thambi+2:wght@400;500;600;700;800&display=swap" rel="stylesheet">

    <!-- My Stylesheet -->
    <link rel="stylesheet" href="style.css">

</head>
<body>
	<div class="container-fluid bg-light p-5 text-center my-3">
		<h2 class="">Age Calculator</h1>

		<h5 class="text-muted">CALCULATE YOUR AGE WITH YEARS, MONTHS, DAYS, HOURS, MINUTES, SECONDS & MILISECONDS.</h5>
    </div>


    <div class="container bg-light p-3 my-5">
        <div class="card-body">
			<div class="row">
				<div class="col-md-12">
					<button class="btn btn-dark">Date of Birth</button>
				</div>
			</div>
			<br>

           <div class="row mb-3"> 
               <div class="col-md-6">
               	<input type="date" class="form-control" id="birth_date" name="birth_date">
                </div>
           </div>
               
           <div class="row text-right">
            <div class="col-md-12">
            <input type="button" class="btn btn-primary " value="Calculate Age" onclick="ageCalculate()">
            </div>
          </div>

      </div>

      <div class="card-footer">
	    	<div class="row" align="left">
				<div class="col-md-12">
					<button class="btn btn-dark">Result</button>
				</div>
			</div>
			<br>
			<div id="age"></div>
      </div>
    </div>

    <hr>

    <footer class="footer mt-auto py-3 bg-light">
        <div class="container text-center">
            <span class="text-muted">Copyright &copy;2020 | Age Calculator | <a href="https://codingdebugging.com/" target="_blank">CodingDebugging.Com</a></span>
        </div>
    </footer>

    <!-- JavaScript Page -->
    <script src="function.js" type="text/javascript"></script>

</body>
</html>

<!DOCTYPE html>

<html>

<head>

<title>Age Calculator - Coding Debugging</title>

</head>

<body>

<h2 class="">Age Calculator</h1>

<h5 class="text-muted">CALCULATE YOUR AGE WITH YEARS, MONTHS, DAYS, HOURS, MINUTES, SECONDS & MILISECONDS.</h5>

</div>

<button class="btn btn-dark">Date of Birth</button>

</div>

<br>

</div>

</div>

<button class="btn btn-dark">Result</button>

</div>

<br>

</div>

<hr>

</div>

</footer>

</body>

</html>

style.css

Create a CSS file named ‘style.css‘ and put those codes given below.

body {
  font-family: "Baloo Thambi 2", cursive;
}

body {

font-family: "Baloo Thambi 2", cursive;

}

function.js

Create a JavaScript file named ‘function.js‘ and put those codes given below.

function ageCalculate(){
   	var birthDate =document.getElementById('birth_date').value;
    var d = new Date(birthDate);

    var mdate = birthDate.toString();
    var yearThen = parseInt(mdate.substring(0,4), 10);
    var monthThen = parseInt(mdate.substring(5,7), 10);
    var dayThen = parseInt(mdate.substring(8,10), 10);
    
    var today = new Date();
    var birthday = new Date(yearThen, monthThen-1, dayThen);
    var differenceInMilisecond = today.valueOf() - birthday.valueOf();
    
    var year_age = Math.floor(differenceInMilisecond / 31536000000);
    var day_age = Math.floor((differenceInMilisecond % 31536000000) / 86400000);
    
    if ((today.getMonth() == birthday.getMonth()) && (today.getDate() == birthday.getDate())) {
        alert("Happy Birthday!!!");
    }
    
    var month_age = Math.floor(day_age/30);
    
    day_age = day_age % 30;
    
    var tMnt= (month_age + (year_age*12));
    var tDays =(tMnt*30) + day_age;
    
    if (isNaN(year_age) || isNaN(month_age) || isNaN(day_age)) {
        document.getElementById("age").innerHTML = ("Invalid birthday - Please try again!");
    }
    else {
        document.getElementById("age").innerHTML = year_age + " years " + month_age + " months " + day_age + " days"
        + "<br/> or <br/> " 
        + tMnt + " months " + day_age + " days" 
        + "<br/> or <br/>" 
        +  tDays + " days" 
        + "<br/> or <br/>" 
        +  tDays*24 + " hours" 
        + "<br/> or <br/>" 
        +  tDays*24*3600 + " seconds" 
        + "<br/> or <br/>" 
        +  tDays*24*3600*1000 + " miliseconds" ;
    }
}

function ageCalculate(){

var birthDate =document.getElementById('birth_date').value;

var d = new Date(birthDate);

var mdate = birthDate.toString();

var yearThen = parseInt(mdate.substring(0,4), 10);

var monthThen = parseInt(mdate.substring(5,7), 10);

var dayThen = parseInt(mdate.substring(8,10), 10);

var today = new Date();

var birthday = new Date(yearThen, monthThen-1, dayThen);

var differenceInMilisecond = today.valueOf() - birthday.valueOf();

var year_age = Math.floor(differenceInMilisecond / 31536000000);

var day_age = Math.floor((differenceInMilisecond % 31536000000) / 86400000);

if ((today.getMonth() == birthday.getMonth()) && (today.getDate() == birthday.getDate())) {

alert("Happy Birthday!!!");

}

var month_age = Math.floor(day_age/30);

day_age = day_age % 30;

var tMnt= (month_age + (year_age*12));

var tDays =(tMnt*30) + day_age;

if (isNaN(year_age) || isNaN(month_age) || isNaN(day_age)) {

document.getElementById("age").innerHTML = ("Invalid birthday - Please try again!");

}

else {

document.getElementById("age").innerHTML = year_age + " years " + month_age + " months " + day_age + " days"

+ "<br/> or <br/> "

+ tMnt + " months " + day_age + " days"

+ "<br/> or <br/>"

+ tDays + " days"

+ "<br/> or <br/>"

+ tDays*24 + " hours"

+ "<br/> or <br/>"

+ tDays*24*3600 + " seconds"

+ "<br/> or <br/>"

+ tDays*24*3600*1000 + " miliseconds" ;

}

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Keep coding, Keep debugging!

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Age Calculator using JavaScript | JavaScript Age Calculator

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