PHP Code Snippet - Add hours and minutes to date time string and convert it to timestamp

snippet.php

<?php

///////////////////////////////////
//                               //
//  Using DateTime Object (OOP)  //
//                               //
///////////////////////////////////

// The original date time string
// NOTE: This is currently using the current date and time
// but you can change the variable below to any valid date time string
$dateString = 'NOW';

// Hours and minutes you would like to add to 
// the date and time string. 
// NOTE: Defaults to 48 hours or 2 days
$hours = 48;
$minutes = 00;

// New date time string calculation
$datetimeObject = new DateTime($dateString);
$datetimeObject->add(new DateInterval('PT'.$hours.'H'.$minutes.'M'));

// OPTIONAL - Conversion to timestamp
$timestamp = $datetimeObject->getTimestamp();


// Output for testing purposes
echo "<b>Using the DateTime Object (OOP): </b><br />";
$datetimeObject = new DateTime($dateString);
$dateString = $datetimeObject->format("Y-m-d\TH:i:s");
echo "<br />Original Date -><br />".$dateString."<br />";

$datetimeObject->add(new DateInterval('PT'.$hours.'H'.$minutes.'M'));
$newDateString = $datetimeObject->format("Y-m-d\TH:i:s");
echo "<br />New Date -><br />".$newDateString."<br />";
echo "<br />Timestamp -><br />".$timestamp."<br /><br /><br />";



///////////////////////////////////
//                               //
//     Using the date method     //
//                               //
///////////////////////////////////

// The original date time string
// NOTE: This is currently using the current date and time
// but you can thange the line below to any valid date time string
$dateString = date('Y-m-d\TH:i:s');

// Hours and minutes you would like to add to 
// the date and time string. 
// NOTE: Defaults to 48 hours or 2 days
$hours = 48;
$minutes = 00;

// New date time string calculation
$newDateString = date('Y-m-d\TH:i:s',strtotime("+$hours hour +$minutes minute",strtotime($dateString)));

// OPTIONAL - Conversion to timestamp
$dateTime = DateTime::createFromFormat("Y-m-d\TH:i:s", $newDateString);
$timestamp = $dateTime->getTimestamp();


// Output for testing purposes
echo "<b>Using the date() method: </b><br />";
echo "<br />Original Date -><br />".$dateString."<br />";
echo "<br />New Date -><br />".$newDateString."<br />";
echo "<br />Timestamp -><br />".$timestamp."<br />";