Online PHP editor | output for h6f7C

Output for 5.6.19 - 5.6.40, 7.0.4 - 7.0.33, 7.1.0 - 7.1.30, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5: string(25) "2014-05-31T23:59:59+02:00" string(10) "1401573599" string(25) "2014-05-31T23:59:59+02:00" int(1401573599) string(10) "1401573599" string(25) "2014-05-31T23:59:59+02:00"
Output for 7.3.32 - 7.3.33, 8.0.13: string(25) "2014-05-31T23:59:59+00:00" string(10) "1401580799" string(25) "2014-05-31T23:59:59+00:00" int(1401580799) string(10) "1401580799" string(25) "2014-05-31T23:59:59+00:00"
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.18, 7.0.0 - 7.0.3: string(25) "2014-05-31T23:59:59+02:00" string(10) "1401573599" string(25) "2014-05-31T23:59:59+02:00" int(1398981599) string(10) "1398981599" string(25) "2014-05-01T23:59:59+02:00"
Output for 5.4.0 - 5.4.45: Fatal error: Class 'DateTimeImmutable' not found in /in/h6f7C on line 3
Process exited with code 255.