PHP ERROR: It is not safe to rely on the system's timezone settings

If you get this error listed bellow:

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date(): It is not safe to rely on the system's timezone settings
mktime(): It is not safe to rely on the system's timezone settings
You can edit your /etc/php.ini file and search:

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date.timezone =
You can edit it eg. like this:

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date.timezone ="US/Central"
After editing you can restart apache:

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service httpd restart
Time Zone list:
https://php.net/manual/en/timezones.php