calculate difference between two dates code example

Example 1: How to calculate the difference between two dates

$datetime1 	= new DateTime('2020-10-11 16:52:52');
$datetime2 	= new DateTime('2020-10-13 16:52:52');
$interval 	= $datetime1->diff($datetime2);

echo $interval->format('%a days');

Example 2: difference between two dates efcore

(EndDate.Date - StartDate.Date).Days //int