Hi @darry19662018,
R-click the bottom panel>Panel Preferences>Tab "items">select "clock" from the list>click the "tool-button" below the list>Time Settings>"Timezone" (hint:leave empty to use localtime).
Type the first letter of the continent ("A" for America, "E" for Europe) and a listing will appear to select the one you want.
PS: I think it is also possible to set TZ in the kernel line - but can't remember at the moment exactly how ...
peace