Subtract Days to the Current Date using PHP

Submitted by argie on Friday, March 7, 2014 - 11:10.

This tutorial will teach you on how to subtract days in a date using PHP. I uses PHP strtotime to subtract days to the current date. Follow the steps bellow to learn this tutorial.

Creating Our Form

Tis code will display our form with the current date and a textbox that allow you to input the number of days you want to subtract in your current date. Copy the code bellow and save it as "index.php".

<form action="index.php" method="GET">
<span style="display: inline-block; width: 150px;">Date</span><input type="text" name="date" required="required" value="<?php echo date("m/d/Y") ?>" /><br>
<span style="display: inline-block; width: 150px;">Number of days</span><input type="text" name="numberofdays" value="<?php echo $nd ?>" autocomplete="off" /><br>
<span style="display: inline-block; width: 150px;">Result</span><input type="text" name="result" value="<?php echo $result ?>" /><br>
<span style="display: inline-block; width: 150px;">&nbsp;</span><input type="submit" value="Calculate" />
</form>

Creating Our Script That add Days to Date

Copy the code bellow and paste it above our form in "Index.php".

<?php 
if (isset($_GET["date"])) { $date  = $_GET["date"]; } else { $date=date("m/d/Y"); }; 
if (isset($_GET["numberofdays"])) { $nd  = $_GET["numberofdays"]; } else { $nd=0; }; 
$result=date('m/d/Y', strtotime($date. ' - '.$nd.' days'));
?>

Summary of Our index.php

The code bellow provides you the exact arrangement of our script

<?php 
if (isset($_GET["date"])) { $date  = $_GET["date"]; } else { $date=date("m/d/Y"); }; 
if (isset($_GET["numberofdays"])) { $nd  = $_GET["numberofdays"]; } else { $nd=0; }; 
$result=date('m/d/Y', strtotime($date. ' - '.$nd.' days'));
?>
<form action="index.php" method="GET">
<span style="display: inline-block; width: 150px;">Date</span><input type="text" name="date" required="required" value="<?php echo date("m/d/Y") ?>" /><br>
<span style="display: inline-block; width: 150px;">Number of days</span><input type="text" name="numberofdays" value="<?php echo $nd ?>" autocomplete="off" /><br>
<span style="display: inline-block; width: 150px;">Result</span><input type="text" name="result" value="<?php echo $result ?>" /><br>
<span style="display: inline-block; width: 150px;">&nbsp;</span><input type="submit" value="Calculate" />
</form>

That's it you've been successfully created a script that subtract days to the current date using strtotime function in PHP.

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