<!DOCTYPE html>
<html>
<body>
Fatal error: Uncaught TypeError: strtotime(): Argument #2 ($baseTimestamp) must be of type ?int, string given in /in/5NFhd:7
Stack trace:
#0 /in/5NFhd(7): strtotime('+1 month', '2017-01-11')
#1 {main}
thrown in /in/5NFhd on line 7
Process exited with code 255.