public TimeZone() 
{

}

Constructs a new instance of this class.

 public Object clone() 
{
        try {
            TimeZone zone = (TimeZone) super.clone();
            return zone;
        } catch (CloneNotSupportedException e) {
            return null;
        }
}

Returns a new {@code TimeZone} with the same ID, {@code rawOffset} and daylight savings time rules as this {@code TimeZone}.

 public static synchronized String[] getAvailableIDs() 
{
        return com.ibm.icu.util.TimeZone.getAvailableIDs();
}

Gets the available time zone IDs. Any one of these IDs can be passed to {@code get()} to create the corresponding {@code TimeZone} instance.

 public static synchronized String[] getAvailableIDs(int offset) 
{
        String[] availableIDs = com.ibm.icu.util.TimeZone.getAvailableIDs();
        int count = 0;
        int length = availableIDs.length;
        String[] all = new String[length];
        for (int i = 0; i <  length; i++) {
            com.ibm.icu.util.TimeZone tz = com.ibm.icu.util.TimeZone
                    .getTimeZone(availableIDs[i]);
            if (tz.getRawOffset() == offset) {
                all[count++] = tz.getID();
            }
        }
        String[] answer = new String[count];
        System.arraycopy(all, 0, answer, 0, count);
        return answer;
}

Gets the available time zone IDs which match the specified offset from GMT. Any one of these IDs can be passed to {@code get()} to create the corresponding {@code TimeZone} instance.

 public int getDSTSavings() 
{
        if (useDaylightTime()) {
            return 3600000;
        }
        return 0;
}

Gets the daylight savings offset in milliseconds for this {@code TimeZone}.

This implementation returns 3600000 (1 hour), or 0 if the time zone does not observe daylight savings.

Subclasses may override to return daylight savings values other than 1 hour.

 public static synchronized TimeZone getDefault() 
{
        if (Default == null) {
            setDefault(null);
        }
        return (TimeZone) Default.clone();
}

Gets the default time zone.

 public final String getDisplayName() 
{
        return getDisplayName(false, LONG, Locale.getDefault());
}

Gets the LONG name for this {@code TimeZone} for the default {@code Locale} in standard time. If the name is not available, the result is in the format {@code GMT[+-]hh:mm}.

 public final String getDisplayName(Locale locale) 
{
        return getDisplayName(false, LONG, locale);
}

Gets the LONG name for this {@code TimeZone} for the specified {@code Locale} in standard time. If the name is not available, the result is in the format {@code GMT[+-]hh:mm}.

 public final String getDisplayName(boolean daylightTime,
    int style) 
{
        return getDisplayName(daylightTime, style, Locale.getDefault());
}

Gets the specified style of name ({@code LONG} or {@code SHORT}) for this {@code TimeZone} for the default {@code Locale} in either standard or daylight time as specified. If the name is not available, the result is in the format {@code GMT[+-]hh:mm}.

 public String getDisplayName(boolean daylightTime,
    int style,
    Locale locale) 
{
        if(icuTimeZone == null || !ID.equals(icuTimeZone.getID())){
            icuTimeZone = com.ibm.icu.util.TimeZone.getTimeZone(ID);
        }
        return icuTimeZone.getDisplayName(
                daylightTime, style, locale);
}

Gets the specified style of name ({@code LONG} or {@code SHORT}) for this {@code TimeZone} for the specified {@code Locale} in either standard or daylight time as specified. If the name is not available, the result is in the format {@code GMT[+-]hh:mm}.

 public String getID() 
{
        return ID;
}

Gets the ID of this {@code TimeZone}.

 public int getOffset(long time) 
{
        if (inDaylightTime(new Date(time))) {
            return getRawOffset() + getDSTSavings();
        }
        return getRawOffset();
}

Gets the offset from GMT of this {@code TimeZone} for the specified date. The offset includes daylight savings time if the specified date is within the daylight savings time period.

 abstract public int getOffset(int era,
    int year,
    int month,
    int day,
    int dayOfWeek,
    int time)
Gets the offset from GMT of this {@code TimeZone} for the specified date and
time. The offset includes daylight savings time if the specified date and
time are within the daylight savings time period.

 abstract public int getRawOffset()
Gets the offset for standard time from GMT for this {@code TimeZone}.

 public static synchronized TimeZone getTimeZone(String name) 
{
        if (AvailableZones == null) {
            initializeAvailable();
        }
        TimeZone zone = AvailableZones.get(name);        
        if(zone == null && isAvailableIDInICU(name)){
            appendAvailableZones(name);
            zone = AvailableZones.get(name); 
        }
        if (zone == null) {
            if (name.startsWith("GMT") && name.length()  > 3) {
                char sign = name.charAt(3);
                if (sign == '+' || sign == '-') {
                    int[] position = new int[1];
                    String formattedName = formatTimeZoneName(name, 4);
                    int hour = parseNumber(formattedName, 4, position);
                    if (hour <  0 || hour  > 23) {
                        return (TimeZone) GMT.clone();
                    }
                    int index = position[0];
                    if (index != -1) {
                        int raw = hour * 3600000;
                        if (index <  formattedName.length()
                                && formattedName.charAt(index) == ':') {
                            int minute = parseNumber(formattedName, index + 1,
                                    position);
                            if (position[0] == -1 || minute <  0 || minute  > 59) {
                                return (TimeZone) GMT.clone();
                            }
                            raw += minute * 60000;
                        } else if (hour  >= 30 || index  > 6) {
                            raw = (hour / 100 * 3600000) + (hour % 100 * 60000);
                        }
                        if (sign == '-') {
                            raw = -raw;
                        }
                        return new SimpleTimeZone(raw, formattedName);
                    }
                }
            }
            zone = GMT;
        }
        return (TimeZone) zone.clone();
}

Gets the {@code TimeZone} with the specified ID.

 public boolean hasSameRules(TimeZone zone) 
{
        if (zone == null) {
            return false;
        }
        return getRawOffset() == zone.getRawOffset();
}

Returns whether the specified {@code TimeZone} has the same raw offset as this {@code TimeZone}.

 abstract public boolean inDaylightTime(Date time)
Returns whether the specified {@code Date} is in the daylight savings time period for
this {@code TimeZone}.

 public static synchronized  void setDefault(TimeZone timezone) 
{
        if (timezone != null) {
            setICUDefaultTimeZone(timezone);
            Default = timezone;
            return;
        }
        String zone = AccessController.doPrivileged(new PriviAction< String >(
                "user.timezone"));
        // sometimes DRLVM incorrectly adds "\n" to the end of timezone ID
        if (zone != null && zone.contains("\n")) {
            zone = zone.substring(0, zone.indexOf("\n")); 
        }
        // if property user.timezone is not set, we call the native method
        // getCustomTimeZone
        if (zone == null || zone.length() == 0) {
            int[] tzinfo = new int[10];
            boolean[] isCustomTimeZone = new boolean[1];
            String zoneId = getCustomTimeZone(tzinfo, isCustomTimeZone);
            // if returned TimeZone is a user customized TimeZone
            if (isCustomTimeZone[0]) {
                // build a new SimpleTimeZone
                switch (tzinfo[1]) {
                case 0:
                    // does not observe DST
                    Default = new SimpleTimeZone(tzinfo[0], zoneId);
                    break;
                default:
                    // observes DST
                    Default = new SimpleTimeZone(tzinfo[0], zoneId, tzinfo[5],
                            tzinfo[4], tzinfo[3], tzinfo[2], tzinfo[9],
                            tzinfo[8], tzinfo[7], tzinfo[6], tzinfo[1]);
                }
            } else {
                // get TimeZone
                Default = getTimeZone(zoneId);
            }
        } else {
            // if property user.timezone is set in command line (with -D option)
            Default = getTimeZone(zone);
        }
        setICUDefaultTimeZone(Default);
}

Sets the default time zone. If passed {@code null}, then the next time #getDefault is called, the default time zone will be determined. This behavior is slightly different than the canonical description of this method, but it follows the spirit of it.

 public  void setID(String name) 
{
        if (name == null) {
            throw new NullPointerException();
        }
        ID = name;
}

Sets the ID of this {@code TimeZone}.

 abstract public  void setRawOffset(int offset)
Sets the offset for standard time from GMT for this {@code TimeZone}.

 abstract public boolean useDaylightTime()
Returns whether this {@code TimeZone} has a daylight savings time period.