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<?php $datetime1 = date_create('2009-10-11'); $datetime2 = date_create('2009-10-13'); $interval = date_diff($datetime1, $datetime2); echo $interval->format('%a days');
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
2 days
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined function date_diff() in /in/le6Xd on line 5
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function date_create() in /in/le6Xd on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: date_create() in /in/le6Xd on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: date_create() in /in/le6Xd on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: date_create() in /in/le6Xd on line 3