Online PHP editor | output for CO77H

Output for 5.1.3 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: string(25) "1970-01-01T01:00:00+01:00" string(25) "1970-01-01T01:00:00+01:00"
Output for 7.3.32 - 7.3.33, 8.0.13: string(25) "1970-01-01T00:00:00+00:00" string(25) "1970-01-01T00:00:00+00:00"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.2: Notice: Use of undefined constant DATE_RFC3339 - assumed 'DATE_RFC3339' in /in/CO77H on line 4 Notice: Use of undefined constant DATE_RFC3339 - assumed 'DATE_RFC3339' in /in/CO77H on line 5 string(23) "ThuAMCETE_RJanuaryC3339" string(23) "ThuAMCETE_RJanuaryC3339"