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run code in 150+ php & hhvm versions
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<?php $post_timestamp = '2014-03-09 20:46:51+04:00'; $pc_time = '2014-03-09 15:56:00'; $post = new DateTime($post_timestamp); $pc = new DateTime($pc_time); $diff = $post->diff($pc); $years = $diff->y; $months = $diff->m; $days = $diff->d; $hours = $diff->h; $minutes = $diff->i; $seconds = $diff->s; echo sprintf('Time Difference %s years, %s months, %s days, %s hours, %s minutes, %s seconds', $years, $months, $days, $hours, $minutes, $seconds);
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Time Difference 0 years, 0 months, 0 days, 1 hours, 50 minutes, 51 seconds
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined method DateTime::diff() in /in/6522o on line 8
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/6522o on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/6522o on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/6522o on line 5