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Object Automation library
There is a newer version: 3.7.10
package com.viaoa.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Locale;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;

/**
 * Helper for building timezone list, display and lookups.
 * @author vvia
 */
public class OATimeZone {
    private static ArrayList alTZ;
    
    public static class TZ {
        public String id;
        public String gmtValue;
        public String shortName;
        public String longName;
        public String getDisplay() {
            return "("+gmtValue+") " + longName + " (" + shortName + ")";
        }
    }

    public static TZ getLocalOATimeZone() {
        TimeZone timeZone = TimeZone.getDefault();
        TZ tz = getOATimeZone(timeZone);
        return tz;
    }
    
    public static ArrayList getOATimeZones() {
        if (alTZ != null) return alTZ;
        alTZ = new ArrayList<>();

        String[] tzs = TimeZone.getAvailableIDs();
        final ArrayList al = new ArrayList<>();
        for (String s : tzs) {
            TimeZone tz = TimeZone.getTimeZone(s);
            al.add(tz);
        }

        Collections.sort(al, (o1, o2) -> {
            int x1 = o1.getRawOffset();
            int x2 = o2.getRawOffset();
            if (x1 == x2) return 0;
            if (x1 > x2) return 1;
            return -1;
        });

        for (TimeZone timeZone : al) {
            long hours = TimeUnit.MILLISECONDS.toHours(timeZone.getRawOffset());
            long minutes = TimeUnit.MILLISECONDS.toMinutes(timeZone.getRawOffset()) - TimeUnit.HOURS.toMinutes(hours);
            // avoid -4:-30 issue
            minutes = Math.abs(minutes);

            String gmtValue = "";
            if (minutes == 0) {
                if (hours >= 0) gmtValue = String.format("GMT+%02d", hours);
                else gmtValue = String.format("GMT-%02d", Math.abs(hours));
            }
            else {
                if (hours >= 0) gmtValue = String.format("GMT+%02d:%02d", hours, minutes);
                else gmtValue = String.format("GMT-%02d:%02d", Math.abs(hours), minutes);
            }

            String shortName = timeZone.getDisplayName(false, timeZone.SHORT, Locale.getDefault());
            
            String longName = timeZone.getDisplayName();

            TZ tz = new TZ();
            tz.id = timeZone.getID();
            tz.shortName = shortName;
            tz.longName = longName;
            tz.gmtValue = gmtValue;
            alTZ.add(tz);
        }
        return alTZ;
    }

    
    /**
     * Find the java TimeZone.
     * @param value can be the tz.id, display name, short name, or long name.
     */
    public static TimeZone getTimeZone(final String value) {
        if (OAString.isEmpty(value)) return TimeZone.getDefault();

        TimeZone timeZone = TimeZone.getTimeZone(value);
        if (timeZone != null) return timeZone;
        
        for (TZ tz : getOATimeZones()) {
            if (value.equalsIgnoreCase(tz.id) || value.equalsIgnoreCase(tz.gmtValue) || value.equalsIgnoreCase(tz.shortName) || value.equalsIgnoreCase(tz.longName) || value.equalsIgnoreCase(tz.getDisplay())) {
                timeZone = TimeZone.getTimeZone(tz.id);
                if (timeZone != null) return timeZone;
            }
        }
        return null;
    }

    public static TZ getOATimeZone(TimeZone timeZone) {
        if (timeZone == null) return null;
        final String id = timeZone.getID();
        for (TZ tz : getOATimeZones()) {
            if (id.equalsIgnoreCase(tz.id)) {
                return tz;
            }
        }
        return null;
    }
    public static TZ getOATimeZone(String value) {
        if (OAString.isEmpty(value)) {
            value = TimeZone.getDefault().getID();
        }

        for (TZ tz : getOATimeZones()) {
            if (value.equalsIgnoreCase(tz.id) || value.equalsIgnoreCase(tz.gmtValue) || value.equalsIgnoreCase(tz.shortName) || value.equalsIgnoreCase(tz.longName) || value.equalsIgnoreCase(tz.getDisplay())) {
                return tz;
            }
        }
        return null;
    }
    
    
    public static void main(String[] args) {
        getOATimeZones();

      //qqqqqqqqqqqqqq                
        //System.out.println(tz.getDisplay());

    }
}