How would I call a javascript function in html?

In order to call the function on page loading just simply call the function in the script section. Use inner HTML to display. Make the code easy and simple.

Here is the script:

function printdate() {
    document.getElementById("dat").innerHTML = Date();
}
printdate();  //calling date

You can also write the function like this:

function printdate() {
    return new Date();
}
document.getElementById("dat").innerHTML =printdate();

The HTML section:

<div>
    <p id="dat"></p>
</div>

This will help you:

Click to see this fiddle

This link will help you to create date format

This snippet shows the date:

   <html>
<head>
<!-- 
   Happy New Years
   Author: Professor Myron Wilson
   Date:   8/1/2006
   Filename:         happynewyears.htm
   Supporting files: e.jpg, library.js, newyearseve.gif, styles.css
-->

<title>North Pole Novelties</title>

<link href="styles.css" rel="stylesheet" type="text/css" />
<!-- Add library.js below -->
<link rel="stylesheet" type="text/css" href="Bootstrap/css/bootstrap.css">
</head>

<body>

<table id="npn" cellpadding="5" cellspacing="0">
<tr>
<!-- Company Hyperlinks -->
<td id="links" rowspan="4" valign="top">
   <a href="#">The New Year's Event Agenda</a>
   <a href="#"></a>
   <a href="#">New Year's Eve Happy Hour</a>
   <a href="#">New Year's Eve Concert</a>
   <a href="#">New Year's Eve Party</a>
   <a href="#">New Year's Day Brunch</a>
</td>

<!-- Days until New Year's Eve -->

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