Fatal error: Uncaught TypeError: strtotime(): Argument #2 ($baseTimestamp) must be of type ?int, string given in /in/vlZ9i:3
Stack trace:
#0 /in/vlZ9i(3): strtotime('-1 day', '2014-09-08')
#1 {main}
thrown in /in/vlZ9i on line 3
Process exited with code 255.