I don't understand how you could miss the list
here -->
Picture 2.png
EDIT: ok, so you found it
timezones go vertically, so for Riga for example, I can select Athens. Probably same for you.
EDIT 2: in console typing [?] will only tell you the syntax, with 5 examples. To see all available options, you need to hit [TAB][TAB]
[normis@demo.mt.lv] /system clock> set time-zone-name=
Africa/Abidjan America/Merida Atlantic/Reykjavik
Africa/Accra America/Mexico_City Atlantic/South_Georgia
Africa/Addis_Ababa America/Miquelon Atlantic/St_Helena
Africa/Algiers America/Moncton Atlantic/Stanley
Africa/Asmara America/Monterrey Australia/Adelaide
Africa/Bamako America/Montevideo Australia/Brisbane
Africa/Bangui America/Montreal Australia/Broken_Hill
Africa/Banjul America/Montserrat Australia/Currie
Africa/Bissau America/Nassau Australia/Darwin
Africa/Blantyre America/New_York Australia/Eucla
Africa/Brazzaville America/Nipigon Australia/Hobart
Africa/Bujumbura America/Nome Australia/Lindeman
Africa/Cairo America/Noronha Australia/Lord_Howe
Africa/Casablanca America/North_Dakota/Center Australia/Melbourne
Africa/Ceuta America/North_Dakota/New_Salem Australia/Perth
Africa/Conakry America/Panama Australia/Sydney
Africa/Dakar America/Pangnirtung CET
Africa/Dar_es_Salaam America/Paramaribo CST6CDT
Africa/Djibouti America/Phoenix EET
Africa/Douala America/Port-au-Prince EST
Africa/El_Aaiun America/Port_of_Spain EST5EDT
Africa/Freetown America/Porto_Velho Europe/Amsterdam
Africa/Gaborone America/Puerto_Rico Europe/Andorra
Africa/Harare America/Rainy_River Europe/Athens
Africa/Johannesburg America/Rankin_Inlet Europe/Belgrade
Africa/Kampala America/Recife Europe/Berlin
Africa/Khartoum America/Regina Europe/Bratislava
Africa/Kigali America/Resolute Europe/Brussels
Africa/Kinshasa America/Rio_Branco Europe/Bucharest
Africa/Lagos America/Santiago Europe/Budapest
<###### I have removed most of the list to save space #######>
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