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run code in 150+ php & hhvm versions
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<?php $time = '1899-12-30 19:30:00'; $dt1 = new DateTime($time); echo $dt1->format('d F Y H:i:s'); echo '<br />'; $time2 = '1899-12-30 21:30:00'; $dt2 = new DateTime($time2); echo $dt2->format('d F Y H:i:s'); echo '<br />'; $inter = ($dt1->diff($dt2)); echo ($inter->days);
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
30 December 1899 19:30:00<br />30 December 1899 21:30:00<br />0
Output for hhvm-3.12.0

Process exited with code 137.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.2.17
30 December 1899 19:30:00<br />30 December 1899 21:30:00<br /> Fatal error: Call to undefined method DateTime::diff() in /in/J2mRe on line 10
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/J2mRe on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/J2mRe on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/J2mRe on line 3