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<?php $row = [ 'sub_date' => '2016-08-29', 'due_date' => '08-23' ]; $duedate = new DateTime(date("Y")."-".$row['due_date']); $submitdate = new DateTime($row['sub_date']); echo $duedate->diff($submitdate)->format("%R%a days");
Output for 5.6.0 - 5.6.27, 7.0.0, 7.0.2 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
+6 days
Output for 7.0.1

Process exited with code 137.
preferences:
99.96 ms | 1637 KiB | 4 Q