Yealink SIP-T48G Administrator's Manual page 561

Time Zone
-11 Samoa
-10 US-Hawaii-Aleutian, US-Alaska-Aleutian
-9:30 French Polynesia
-9 US-Alaska Time
Canada(Vancouver,Whitehorse), Mexico(Tijuana,Mexicali),
-8
US-Pacific Time
Canada(Edmonton,Calgary), Mexico(Mazatlan,Chihuahua),
-7
US-MST no DST, US-Mountain Time
Canada-Manitoba(Winnipeg), Chile(Easter Islands),
-6
Mexico(Mexico City,Acapulco), US-Central Time
Bahamas(Nassau), Canada(Montreal,Ottawa,Quebec),
-5
Cuba(Havana), US-Eastern Time
-4:30 Venezuela(Caracas)
Canada(Halifax,Saint John), Chile(Santiago),
-4 Paraguay(Asuncion), UK(Falkland Islands),
UK-Bermuda(Bermuda), Trinidad&Tobago
-3:30 Canada-New Foundland(St.Johns)
Argentina(Buenos Aires), Brazil(DST), Brazil(no DST),
-3
Denmark-Greenland(Nuuk)
-2:30 Newfoundland and Labrador
-2 Brazil(no DST)
-1 Portugal(Azores)
Denmark-Faroe Islands(Torshavn), GMT, Greenland,
0 Ireland(Dublin), Morocco, Portugal(Lisboa,Porto,Funchal),
Spain-Canary Islands(Las Palmas),UK(London)
Albania(Tirane), Austria(Vienna), Belgium(Brussels),
Caicos, Chad, Croatia(Zagreb), Czech Republic(Prague),
Denmark(Kopenhagen), France(Paris), Germany(Berlin),
+1
Hungary(Budapest), Italy(Rome), Luxembourg(Luxembourg),
Macedonia(Skopje), Namibia(Windhoek),
Netherlands(Amsterdam), Spain(Madrid)
Estonia(Tallinn), Finland(Helsinki), Gaza Strip(Gaza),
Greece(Athens), Israel(Tel Aviv), Jordan(Amman), Latvia(Riga),
+2 Lebanon(Beirut), Moldova(Kishinev), Romania(Bucharest),
Russia(Kaliningrad), Syria(Damascus), Turkey(Ankara),
Ukraine(Kyiv, Odessa)
+3 East Africa Time, Iraq(Baghdad), Russia(Moscow)
+3:30 Iran(Teheran)
Armenia(Yerevan), Azerbaijan(Baku), Georgia(Tbilisi),
+4
Kazakhstan(Aktau), Russia(Samara)
Time Zone Name
Appendix
547