# Age Calculator Using Javascript ( Source Code )

Hello, coders! In this post, we’ll look at how to create a Javascript age calculator using your date of birth and other features that display the number of days till your next birthday. JavaScript was employed to build this project. You should utilize a more practical project while learning something new, thus we decided to help you understand the notion by using a straightforward age calculator.

Hope you enjoy our blog so let’s start with a basic HTML structure for Age Calculator javascript.

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## HTML code for Age Calculator

JavaScript offers some built-in date and time functions, which helps to calculate the age from the date (Date of Birth). Using these JavaScript methods, you can easily find the age of anyone. For this, we require a date input from the user and the current system date.

```<body>
<div class="container">
<form>
<div class="base">
<div class="enter"><h4>Age Calculator</h4></div>
<div class="block">
<p class="title">Date</p>
<input
type="text"
name="date"
id="date"
placeholder="dd"
required="required"
minlength="1"
maxlength="2"
/>
</div>
<div class="block">
<p class="title">Month</p>
<input
type="text"
name="month"
id="month"
placeholder="mm"
required="required"
minlength="1"
maxlength="2"
/>
</div>
<div class="block">
<p class="title">Year</p>
<input
type="text"
name="year"
id="year"
placeholder="yyyy"
required="required"
minlength="4"
maxlength="4"
/>
</div>
</div>
<div class="base">
<div class="enter">
<input
type="button"
name="submit"
value="Submit"
onclick="age()"
/>
</div>
</div>
<div id="age"></div>
</form>
</div>
</body>```

We will use HTML concepts to build the basic structure for our age calculator website, but first we must add some file links to our html file. Making distinct files for each language and linking them together inside our website is the simplest way to handle a project, which is crucial when developing one. Here, inside the head section of our HTML, we’ll place the links for our external CSS file, and the link for our javascript file. Before the body tag is finished, we will additionally include links to those files.

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Adding the Structure for our age calculator:

• First and foremost, we will create a div container that will contain our calculator structure.
• We will now add the heading to our age calculator using H3 tags.
• Now we make a div with the label “select our date of birth” and input of type “birth” for selecting the date from a calendar.
• We will now display the current date using the same method input type=”date,” and we will disable the property that allows us to change the current date.
• Now we’ll create a button with the button tag and add the onClick function to it.

Let’s take a look at our HTML structure without any styling.

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Html Code output for the Age Calculator

## CSS Code for Age Calculator

```body {
font-family: Arial, Helvetica, sans-serif;
background-color: #2782e3;
font-size: 15px;
line-height: 1.5;
margin: 0;
}
* {
box-sizing: border-box;
}
.container {
width: 520px;
height: auto;
margin: 100px auto;
background-color: #eee;
}
.base {
width: 100%;
margin: 0;
overflow: hidden;
display: block;
float: none;
}
.block {
width: 135px;
margin-left: 20px;
display: inline-block;
float: left;
}
.base h4 {
font-size: 26px;
text-align: center;
font-family: sans-serif;
font-weight: normal;
margin-top: 0px;
box-shadow: 0px 2px #bababa;
background: white;
font-size: 34px;
color: navy;
}
.title {
font-size: 20px;
text-align: left;
font-family: sans-serif;
font-weight: normal;
line-height: 0.5;
letter-spacing: 0.5px;
word-spacing: 2.7px;
color: #1073d0;
}
input[type="text"] {
width: 140px;
margin: auto;
outline: none;
min-height: 50px;
border: 2px solid #1073d0;
background-color: #f7f7f7;
color: #1073d0;
font-size: 17px;
}
input[type="text"]:focus {
background-color: #ffffff;
border: 2px solid orange;
outline: none;
}
input[type="button"] {
width: 150px;
margin-left: 35%;
margin-top: 40px;
outline: none;
border: none;
background-color: #0761b6;
color: #ffffff;
text-align: center;
font-size: 16px;
}
input[type="button"]:hover {
background-color: #003669;
}
#age {
display: block;
margin: 10px;
margin-top: 35px;
overflow: hidden;
font-family: verdana;
font-size: 23px;
font-weight: normal;
line-height: 1.5;
word-spacing: 2.7px;
color: navy;
}
```

Now that we’ve included our CSS code in our article, let’s go over it step by step.

Step1: We will set the font family to “Arial” using the body tag selector, and we will set the background colour to “blue” using the background property. Our body is configured with “zero” padding and margin.

```body {
font-family: Arial, Helvetica, sans-serif;
background-color: #2782e3;
font-size: 15px;
line-height: 1.5;
margin: 0;
}

* {
box-sizing: border-box;
}```

Step2:Now we will add a width and height of 520px for the width and auto for the height using the class selector (.container), and we will add a margin of 100px around the container using the margin property. We have added a 25-px border radius to our calculator container using the border radius parameter.

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```.container {
width: 520px;
height: auto;
margin: 100px auto;
background-color: #eee;
}```

Step3:We will now style the parts of the age calculator using the class selector. We will give our h4 tag a font-size of 26px, and we will centre the content using the text-align property. The font is displayed in “navy blue.”

```.block {
width: 135px;
margin-left: 20px;
display: inline-block;
float: left;
}

.base h4 {
font-size: 26px;
text-align: center;
font-family: sans-serif;
font-weight: normal;
margin-top: 0px;
box-shadow: 0px 2px #bababa;
background: white;
font-size: 34px;
color: navy;
}

.title {
font-size: 20px;
text-align: left;
font-family: sans-serif;
font-weight: normal;
line-height: 0.5;
letter-spacing: 0.5px;
word-spacing: 2.7px;
color: #1073d0;
}

input[type="text"] {
width: 140px;
margin: auto;
outline: none;
min-height: 50px;
border: 2px solid #1073d0;
background-color: #f7f7f7;
color: #1073d0;
font-size: 17px;
}

input[type="text"]:focus {
background-color: #ffffff;
border: 2px solid orange;
outline: none;
}

input[type="button"] {
width: 150px;
margin-left: 35%;
margin-top: 40px;
outline: none;
border: none;
background-color: #0761b6;
color: #ffffff;
text-align: center;
font-size: 16px;
}

input[type="button"]:hover {
background-color: #003669;
}

#age {
display: block;
margin: 10px;
margin-top: 35px;
overflow: hidden;
font-family: verdana;
font-size: 23px;
font-weight: normal;
line-height: 1.5;
word-spacing: 2.7px;
color: navy;
}```

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output age calculator

Now add javascript for the age calculator. We create function age and get all html elements in javascript so we get what the user enters in input. After that, we define a new code that gets today’s date, month, and year so that when a user enters an age javascript can do calculations of 2 values and show output in the age calculator.

## Javascript Code For Age Calculator

```function age() {
var d1 = document.getElementById("date").value;
var m1 = document.getElementById("month").value;
var y1 = document.getElementById("year").value;
var date = new Date();
var d2 = date.getDate();
var m2 = 1 + date.getMonth();
var y2 = date.getFullYear();
var month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
if (d1 > d2) {
d2 = d2 + month[m2 - 1];
m2 = m2 - 1;
}
if (m1 > m2) {
m2 = m2 + 12;
y2 = y2 - 1;
}
var d = d2 - d1;
var m = m2 - m1;
var y = y2 - y1;
document.getElementById("age").innerHTML =
"Your Age is " + y + " Years " + m + " Months " + d + " Days";
}
```

First of all we will create an array of number of days of every month and will store their value under the month variable.

Using the document.getELementById selector to select the html and storing their value into the new variables.

We were able to acquire the device’s time and date by using the new Date () function. The JavaScript method “New Date” can be used to get the most recent dates from your device. The current year, current date, and current month are what determine these three variables, which essentially represent the current time.

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Now we’ll write a conditional statement that states to add the value of the current month to the current date if the value of our current month is less than 10.

In order to determine the age difference between the birthdate and the current date, we will now create a method named ageCalculate() and use the if-else conditional expression. After that, we merely add those values to our HTML element.

We now have the functionality to our age calculator . Let’s watch a quick video to see how it works.

## Source Code Button:

Now that we have completed our html,css and, and javascript Code for Age Calculator,  Here is our updated output with javascript.

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Conclusion
Hope you like Age Calculator in javascript, you can see the output video and project screenshots. See our other blogs and gain knowledge in front-end development. Thank you

In this post, we learn how to create an Age Calculator javascript using simple HTML & CSS, and javascript. If we made a mistake or any confusion, please drop a comment to reply or help you in easy learning.

Written by – Code With Random/Anki

### Which code editor do you use for this Age Calculator project coding?

I personally recommend using VS Code Studio, it’s very simple and easy to use.

### is this project responsive or not?

Yes! this project is a responsive project.

No!