package com.mkyong.date;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.util.*;
public class DisplayZoneAndOffSet {
public static void main(String[] argv) {
Map<String, String> sortedMap = new LinkedHashMap<>();
List<String> zoneList = new ArrayList<>(ZoneId.getAvailableZoneIds());
//Get all ZoneIds
Map<String, String> allZoneIds = getAllZoneIds(zoneList);
//sort map by key
/*allZoneIds.entrySet().stream()
.sorted(Map.Entry.comparingByKey())
.forEachOrdered(e -> sortedMap.put(e.getKey(), e.getValue()));*/
//sort by value, descending order
allZoneIds.entrySet().stream()
.sorted(Map.Entry.<String, String>comparingByValue().reversed())
.forEachOrdered(e -> sortedMap.put(e.getKey(), e.getValue()));
// print map
sortedMap.forEach((k, v) ->
{
String out = String.format("%35s (UTC%s) %n", k, v);
System.out.printf(out);
});
System.out.println("\nTotal Zone IDs " + sortedMap.size());
}
private static Map<String, String> getAllZoneIds(List<String> zoneList) {
Map<String, String> result = new HashMap<>();
LocalDateTime dt = LocalDateTime.now();
for (String zoneId : zoneList) {
ZoneId zone = ZoneId.of(zoneId);
ZonedDateTime zdt = dt.atZone(zone);
ZoneOffset zos = zdt.getOffset();
//replace Z to +00:00
String offset = zos.getId().replaceAll("Z", "+00:00");
result.put(zone.toString(), offset);
}
return result;
}
}
Output
//display all zone id and its UTC offset
Etc/GMT+12 (UTC-12:00)
Pacific/Pago_Pago (UTC-11:00)
Pacific/Samoa (UTC-11:00)
Pacific/Niue (UTC-11:00)
US/Samoa (UTC-11:00)
Etc/GMT+11 (UTC-11:00)
Pacific/Midway (UTC-11:00)
Pacific/Honolulu (UTC-10:00)
Pacific/Rarotonga (UTC-10:00)
Pacific/Tahiti (UTC-10:00)
Pacific/Johnston (UTC-10:00)
US/Hawaii (UTC-10:00)
SystemV/HST10 (UTC-10:00)
Etc/GMT+10 (UTC-10:00)
Pacific/Marquesas (UTC-09:30)
Etc/GMT+9 (UTC-09:00)
Pacific/Gambier (UTC-09:00)
America/Atka (UTC-09:00)
SystemV/YST9 (UTC-09:00)
America/Adak (UTC-09:00)
US/Aleutian (UTC-09:00)
Etc/GMT+8 (UTC-08:00)
US/Alaska (UTC-08:00)
America/Juneau (UTC-08:00)
America/Metlakatla (UTC-08:00)
America/Yakutat (UTC-08:00)
Pacific/Pitcairn (UTC-08:00)
America/Sitka (UTC-08:00)
America/Anchorage (UTC-08:00)
SystemV/PST8 (UTC-08:00)
America/Nome (UTC-08:00)
SystemV/YST9YDT (UTC-08:00)
Canada/Yukon (UTC-07:00)
US/Pacific-New (UTC-07:00)
Etc/GMT+7 (UTC-07:00)
US/Arizona (UTC-07:00)
America/Dawson_Creek (UTC-07:00)
Canada/Pacific (UTC-07:00)
PST8PDT (UTC-07:00)
SystemV/MST7 (UTC-07:00)
America/Dawson (UTC-07:00)
Mexico/BajaNorte (UTC-07:00)
America/Tijuana (UTC-07:00)
America/Creston (UTC-07:00)
America/Hermosillo (UTC-07:00)
America/Santa_Isabel (UTC-07:00)
America/Vancouver (UTC-07:00)
America/Ensenada (UTC-07:00)
America/Phoenix (UTC-07:00)
America/Whitehorse (UTC-07:00)
America/Fort_Nelson (UTC-07:00)
SystemV/PST8PDT (UTC-07:00)
America/Los_Angeles (UTC-07:00)
US/Pacific (UTC-07:00)
America/El_Salvador (UTC-06:00)
America/Guatemala (UTC-06:00)
America/Belize (UTC-06:00)
America/Managua (UTC-06:00)
America/Tegucigalpa (UTC-06:00)
Etc/GMT+6 (UTC-06:00)
Mexico/BajaSur (UTC-06:00)
America/Regina (UTC-06:00)
America/Denver (UTC-06:00)
Pacific/Galapagos (UTC-06:00)
America/Yellowknife (UTC-06:00)
America/Swift_Current (UTC-06:00)
America/Inuvik (UTC-06:00)
America/Mazatlan (UTC-06:00)
America/Boise (UTC-06:00)
America/Costa_Rica (UTC-06:00)
Canada/East-Saskatchewan (UTC-06:00)
MST7MDT (UTC-06:00)
SystemV/CST6 (UTC-06:00)
America/Chihuahua (UTC-06:00)
America/Ojinaga (UTC-06:00)
US/Mountain (UTC-06:00)
America/Edmonton (UTC-06:00)
Canada/Mountain (UTC-06:00)
America/Cambridge_Bay (UTC-06:00)
Navajo (UTC-06:00)
SystemV/MST7MDT (UTC-06:00)
Canada/Saskatchewan (UTC-06:00)
America/Shiprock (UTC-06:00)
America/Panama (UTC-05:00)
America/Chicago (UTC-05:00)
America/Eirunepe (UTC-05:00)
Etc/GMT+5 (UTC-05:00)
Pacific/Easter (UTC-05:00)
Mexico/General (UTC-05:00)
America/Porto_Acre (UTC-05:00)
America/Guayaquil (UTC-05:00)
America/Rankin_Inlet (UTC-05:00)
US/Central (UTC-05:00)
America/Rainy_River (UTC-05:00)
America/Indiana/Knox (UTC-05:00)
America/North_Dakota/Beulah (UTC-05:00)
America/Monterrey (UTC-05:00)
America/Jamaica (UTC-05:00)
America/Atikokan (UTC-05:00)
America/Coral_Harbour (UTC-05:00)
America/North_Dakota/Center (UTC-05:00)
America/Indiana/Tell_City (UTC-05:00)
Chile/EasterIsland (UTC-05:00)
America/Mexico_City (UTC-05:00)
America/Matamoros (UTC-05:00)
CST6CDT (UTC-05:00)
America/Knox_IN (UTC-05:00)
America/Bogota (UTC-05:00)
America/Menominee (UTC-05:00)
America/Resolute (UTC-05:00)
SystemV/EST5 (UTC-05:00)
Canada/Central (UTC-05:00)
Brazil/Acre (UTC-05:00)
America/Cancun (UTC-05:00)
America/Lima (UTC-05:00)
America/Bahia_Banderas (UTC-05:00)
US/Indiana-Starke (UTC-05:00)
America/Rio_Branco (UTC-05:00)
SystemV/CST6CDT (UTC-05:00)
Jamaica (UTC-05:00)
America/Merida (UTC-05:00)
America/North_Dakota/New_Salem (UTC-05:00)
America/Winnipeg (UTC-05:00)
America/Caracas