Provides additional functionality to the DateInterval class.

The DateInterval class builds on the existing DateInterval class provided by PHP. With the new class, you may

• convert DateInterval to the interval spec
• convert DateInterval to the number of seconds
  • convert back to DateInterval from the number of seconds

The conversion to seconds requires a bit of explaining.

Add it to your list of Composer dependencies:

$ composer require kamilkrzywda/date-interval=1.*

<?php

use Herrera\DateInterval\DateInterval;

$interval = new DateInteval('P2H');

echo $interval->toSeconds(); // "7200"
echo DateInterval::toSeconds($interval); // "7200"

echo $interval->toSpec(); // "P2H"
echo DateInterval::toSpec($interval); // "P2H"