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It's a downward-facing triangle in the upper-right corner of the screen. A drop-down menu will appear. This wrench-and-screwdriver-shaped icon is in the lower-left corner of the drop-down menu. Doing so opens the Ubuntu Control Center. It's at the bottom of the sidebar that's on the left side of the window. Make sure that your mouse is over the left-hand sidebar when scrolling. You'll find this tab on the left side of the window. Click the blue "Automatic Time Zone" switch in the middle of the page to do so. If the "Automatic Time Zone" switch is grey, skip this step. It's near the bottom of the window. Doing so opens the Time Zone menu. Click your approximate location on the world map to do so. You should see the time change to match the selected area's time zone. This will save your settings and update your time zone accordingly.
Click the "System Menu" icon . Click the "Settings" icon. Scroll down and click Details. Click Date & Time. Turn off Automatic Time Zone. Click Time Zone. Select a time zone. Close the window.