Time specific php code snippets

datetime.php

<?php 

//get difference between two dates in days
 //$now = time(); // or your date as well
     $now = strtotime("2016-07-28");
     $your_date = strtotime("2016-07-26");
     $datediff = $now - $your_date;
     echo floor($datediff/(60*60*24));
     
//check from date is after than to date
//1 use above code check if the echo value is -
//or use bellow code
if (new DateTime($from_date) > new DateTime($to_date)) {
	     array_push($errors, 'Start date and end date Invalid');
}