/**
* Use cases :
* - Calculate difference between 2 days
* - Fetch the position of a date from another
* - How many days form my birthday
*
* Returns a Duration Class @see Ddd\Time\Model\Duration.
*
*/
public function testHowToKnowDiffBetweenItAndAnOtherDate()
{
$jan1 = new Date(2013, 1, 1);
$jan10 = new Date(2013, 1, 10);
$diff = $jan1->diff($jan10);
$this->assertInstanceOf('Ddd\\Time\\Model\\Duration', $diff);
$this->assertEquals($diff, new Duration(9, TimeUnit::day()));
}
