strtotime(): It is not safe to rely on the system's timezone settings.
You are *required* to use the date.timezone setting or the date_default_timezone_set() function.
In case you used any of those methods and you are still getting this warning,
you most likely misspelled the timezone identifier. We selected 'Asia/Chongqing' for 'CST/8.0
DST' instead
PHP
Asia/Shanghai