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<?php echo (new DateTime('- half hour', new DateTimeZone('America/Sao_Paulo')))->format('Ymd H:i:s');
based on SRjtf
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (- half hour) at position 0 (-): Unexpected character in /in/iPVNj:3 Stack trace: #0 /in/iPVNj(3): DateTime->__construct('- half hour', Object(DateTimeZone)) #1 {main} thrown in /in/iPVNj on line 3
Process exited with code 255.
Output for 5.4.0 - 5.6.27
Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (- half hour) at position 0 (-): Unexpected character' in /in/iPVNj:3 Stack trace: #0 /in/iPVNj(3): DateTime->__construct('- half hour', Object(DateTimeZone)) #1 {main} thrown in /in/iPVNj on line 3
Process exited with code 255.