Fatal error: Uncaught TypeError: date_diff(): Argument #1 ($baseObject) must be of type DateTimeInterface, string given in /in/ekXOm:3
Stack trace:
#0 /in/ekXOm(3): date_diff('2013-01-04', '2013-01-01')
#1 {main}
thrown in /in/ekXOm on line 3
Process exited with code 255.