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 
DateIntervalto the interval spec - convert 
DateIntervalto the number of seconds- convert back to 
DateIntervalfrom the number of seconds 
 - convert back to 
 
The conversion to seconds requires a bit of explaining.
Add it to your list of Composer dependencies:
$ composer require herrera-io/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"