Change the date, time and timezone
Click the system menu on the right side of the top bar.
Click the settings button at the bottom left of the menu.
Select the Date & Time panel.
Make sure that the Automatic Time Zone item is switched off, and then click the Time Zone item below.
Click on your location on the world map. This selects your current city, which you can also search for in the search box above the map.
Close the world map window to go back to the Date & Time.
Make sure that the Automatic Date & Time item is switched off, and then click the Date & Time item below to open the Date & Time window. There you can adjust your date and time settings by clicking on the + or - buttons.
Close the window to go back to the Date & Time, and then close the panel.