Simple Age Calculator using PHP. In this script, the user will enter their date of birth. The PHP function will calculate the age in years, months, and days using DateTime and diff() function and show the outcome on the page.
Get the Date of Birth from the form
$dob = $_POST['dob'];
The date will be in the format YYYY-MM-DD.
Create DateTime objects
$dobObject = new DateTime($dob); $today = new DateTime();
$dobObject → Creates a DateTime object from the entered date of birth.
$today → Creates a DateTime object for the current date (today).
Calculate the difference
$ageInterval = $today->diff($dobObject);
The diff() method compares two DateTime objects and returns a DateInterval object.
Store the age in an array
$age = [
'years' => $ageInterval->y,
'months' => $ageInterval->m,
'days' => $ageInterval->d
];$ageInterval->y → Number of years between DOB and today.
$ageInterval->m → Remaining months after subtracting years.
$ageInterval->d → Remaining days after subtracting months.
Here is the full code that we have written during this tutorial:
<?php
if (isset($_POST['calculate'])) {
$dob = $_POST['dob'];
$dobObject = new DateTime($dob);
$today = new DateTime();
$ageInterval = $today->diff($dobObject);
$age = [
'years' => $ageInterval->y,
'months' => $ageInterval->m,
'days' => $ageInterval->d
];
}
?>
<!DOCTYPE html>
<html>
<head>
<title>PHP Age Calculator</title>
<style>
body {
font-family: Arial, sans-serif;
background: linear-gradient(120deg, #6a11cb 0%, #2575fc 100%);
color: #333;
margin: 0;
padding: 0;
}
.container {
max-width: 450px;
background: #fff;
padding: 30px;
margin: 80px auto;
border-radius: 12px;
box-shadow: 0 8px 20px rgba(0,0,0,0.15);
text-align: center;
}
h2 {
color: #2575fc;
margin-bottom: 20px;
}
label {
font-weight: bold;
display: block;
margin-bottom: 10px;
}
input[type="date"] {
padding: 10px;
border: 1px solid #ccc;
border-radius: 6px;
width: 100%;
margin-bottom: 20px;
font-size: 16px;
}
button {
background: #2575fc;
color: white;
padding: 10px 20px;
border: none;
font-size: 16px;
border-radius: 6px;
cursor: pointer;
transition: 0.3s;
}
button:hover {
background: #1e5ed8;
}
.result {
margin-top: 20px;
padding: 15px;
background: #f4f6ff;
border-left: 5px solid #2575fc;
border-radius: 6px;
}
</style>
</head>
<body>
<div class="container">
<h2>PHP Age Calculator</h2>
<form method="post">
<label>Enter Date of Birth:</label>
<input type="date" name="dob" required>
<button type="submit" name="calculate">Calculate Age</button>
</form>
<?php if (isset($age)) { ?>
<div class="result">
<h3>Your Age is:</h3>
<p><strong><?php echo $age['years']; ?></strong> Years,
<strong><?php echo $age['months']; ?></strong> Months,
<strong><?php echo $age['days']; ?></strong> Days</p>
</div>
<?php } ?>
</div>
</body>
</html>View Demo
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