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PHP - Convert Gregorian Date To Julian Day

In this tutorial we will create a Convert Gregorian Date To Julian Day using PHP. This code will automatically calculate the total julian day when user inputted a regular date entry. The code use PHP POST method to launch a function that convert the given Gregorian date into Julian days using gregoriantojd() by adding a date as an argument. This is a user-friendly kind of program feel free to modify it.

We will be using PHP as a scripting language and interpreter that is used primarily on any webserver including xamp, wamp, etc. It is being use to any famous websites and it has a modern technology that can easily be use by the next generation.

Getting Started:

First you have to download & install XAMPP or any local server that run PHP scripts. Here's the link for XAMPP server

And, this is the link for the bootstrap that i used for the layout design

Creating The Interface

This is where we will create a simple form for our application. To create the forms simply copy and write it into your text editor, then save it as index.php.

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4. <meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1" />
  5. <link rel="stylesheet" type="text/css" href="css/bootstrap.css" />
  6. </head>
  7. <body>
  8. <nav class="navbar navbar-default">
  9. <div class="container-fluid">
  10. <a class="navbar-brand" href="">Sourcecodester</a>
  11. </div>
  12. </nav>
  14. <div class="col-md-3"></div>
  15. <div class="col-md-6 well">
  16. <h3 class="text-primary">PHP - Convert Gregorian Date To Julian Day</h3>
  17. <hr style="border-top:1px dotted #ccc;"/>
  18. <div class="col-md-3"></div>
  19. <div class="col-md-6">
  20. <form method="POST" action="">
  21. <div class="form-group">
  22. <label>Enter a date</label>
  23. <input type="date" name="date" class="form-control" required="required"/>
  24. </div>
  25. <center><button class="btn btn-primary" name="convert">Convert</button></center>
  26. </form>
  27. <?php include'converter.php'?>
  28. </div>
  29. </div>
  30. </body>
  31. </html>

Creating the Main Function

This code contains the main function of the application. This code will convert a date into a julian day when the button is clicked. To make this just copy and write these block of codes below inside the text editor, then save it as converter.php

  1. <?php
  2. if(ISSET($_POST['convert'])){
  3. $month=date("n", strtotime($_POST['date']));
  4. $day=date("d", strtotime($_POST['date']));
  5. $year=date("Y", strtotime($_POST['date']));
  7. $julian = gregoriantojd($month, $day, $year);
  9. echo "<center><h2>The Julian Day is <span class='text-success'>".$julian."</span></h2></center>";
  10. }
  11. ?>

There you have it we successfully created Convert Gregorian Date To Julian Day using PHP. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

Note: Due to the size or complexity of this submission, the author has submitted it as a .zip file to shorten your download time. After downloading it, you will need a program like Winzip to decompress it.

Virus note: All files are scanned once-a-day by for viruses, but new viruses come out every day, so no prevention program can catch 100% of them.


1. Re-scan downloaded files using your personal virus checker before using it.
2. NEVER, EVER run compiled files (.exe's, .ocx's, .dll's etc.)--only run source code.

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