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<?php $x = (string) intval(date('Y'))-1; $x .= '-1-1'; echo $x; echo '\n'; echo date('Y-m-d',$x);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
2012-1-1\n Fatal error: Uncaught TypeError: date(): Argument #2 ($timestamp) must be of type ?int, string given in /in/8KZ2G:7 Stack trace: #0 /in/8KZ2G(7): date('Y-m-d', '2012-1-1') #1 {main} thrown in /in/8KZ2G on line 7
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 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 - 7.4.25, 7.4.27 - 7.4.33
2012-1-1\n Notice: A non well formed numeric value encountered in /in/8KZ2G on line 7 1970-01-01
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 7.3.32 - 7.3.33, 7.4.26
2012-1-1\n1970-01-01

preferences:
210.92 ms | 402 KiB | 384 Q