PHP: DateTime common

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<?

// Get Year
$today = new DateTime();
$year = $today->format('Y');

// Set Date 
$date = new DateTime();
$date->setDate(2014, 12, 31);

// Echo date 
echo $date->format('Y-m-d');

// Get Time difference
$interval = $today->diff($end_of_year);
echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days ";
echo "difference " . $interval->days . " days ";

// Get No of days in a year 
// set date for both start and end of year, then use the following
$interval = $end_of_year->diff($start_of_year);
$days_in_year = $interval->days + 1;
echo $days_in_year;