You can set your time zone either by selecting your computer's physical location, or by your time zone's offset from Universal Coordinated Time (also known as UTC).
Notice the two tabs at the top of the screen. The first tab offers you the ability to configure by location. With this option, you can choose your view. In choosing View, your options are: World, North America, South America, Pacific Rim, Europe, Africa, and Asia.
From the interactive map, you can click on a specific city, as indicated by the yellow dots, and a red X will appear at your selection.
You can also scroll through the city list and choose your desired time zone.
The second tab offers you the ability to use the Universal Coordinated Time (UTC) offset. Here, you'll find a list of offsets for you to choose from, as well as an option to set Daylight-Saving Time.
For both tabs, there is the option of selecting System Clock uses UTC. (UTC, also known as GMT, will allow your system to properly handle daylight-saving time.) Please select this if your computer's hardware clock is set to UTC (instead of being set to your local time).