It's because UTC says it's 18, currently
RIGHT NOW:    3:51 AM 🙂
Tuesday, December 18, 2018Â
Coordinated Universal Time (UTC)
All of these options should be fully outlined in the Control Panel where we've spent countless hours providing examples for just about every configuration item. As you're not an administrator you've likely never seen these options, so most of this would be unknown to a standard user of a forum.
Where we welcome questions and suggestions from everyone, if you're going to post support inquiries please have a basic understanding of the default tools available to an administrative team by either being on an administrative team or owning a license to the software so you could operate your own copy of the software.