Examples of java.util.TimeZone.useDaylightTime()

java.util.TimeZone.useDaylightTime()
Queries if this time zone uses daylight savings time.
If an underlying TimeZone implementation subclass supports historical Daylight Saving Time schedule changes, the method refers to the latest Daylight Saving Time schedule information. @return true if this time zone uses daylight savings time,false, otherwise.

    int offset = zone.getRawOffset() / 1000;
    int hour = offset / 3600;
    int min = (offset % 3600) / 60;
    DateFormat dfm = new SimpleDateFormat("z");
    dfm.setTimeZone(zone);
    boolean hasDaylight = zone.useDaylightTime();
    String first = dfm.format(new GregorianCalendar(2010, 1, 1).getTime()).substring(0, 3); // make it only 3 letters code
    String second = dfm.format(new GregorianCalendar(2011, 6, 6).getTime()).substring(0, 3); // make it only 3 letters code
    int mid = hour * -1;
    timezoneShortForm = first + Integer.toString(mid);
    if (min != 0) {

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         * 
         * By default, Java takes the any time that has ambiguities as standard
         * time, so we only need to check for the case when we don't prefer
         * standard time.
         */
        if (!preferStandardTimeValue && tz.useDaylightTime())
        {
            // only relevant if we prefer daylight savings on
            // ambiguities and if the time zone supports daylight savings
            
            int dstoffsetMillis = calendar

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        TimeZone tz = TimeZone.getDefault();


        tzname = new PyTuple(new PyObject[] { new PyString(getDisplayName(tz, false, 0)),
                new PyString(getDisplayName(tz, true, 0)) });


        daylight = tz.useDaylightTime() ? 1 : 0;
        timezone = -tz.getRawOffset() / 1000;
        altzone = timezone - getDSTSavings(tz) / 1000;
    }


    public static double time() {

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                    tzNames.put(zone[LONG_STD], tz);
                }
                if (!tzNames.containsKey(zone[SHORT_STD])){
                    tzNames.put(zone[SHORT_STD], tz);
                }
                if (tz.useDaylightTime()) {
                    if (!tzNames.containsKey(zone[LONG_DST])){
                        tzNames.put(zone[LONG_DST], tz);
                    }
                    if (!tzNames.containsKey(zone[SHORT_DST])){
                        tzNames.put(zone[SHORT_DST], tz);

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         * {@inheritDoc}
         */
        @Override
        public void appendTo(final StringBuffer buffer, final Calendar calendar) {
            final TimeZone zone = calendar.getTimeZone();
            if (zone.useDaylightTime()
                    && calendar.get(Calendar.DST_OFFSET) != 0) {
                buffer.append(getTimeZoneDisplay(zone, true, mStyle, mLocale));
            } else {
                buffer.append(getTimeZoneDisplay(zone, false, mStyle, mLocale));
            }

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            if (tz == null)      return;


            // otherwise print out normally.
            int offset;
            if (tz.inDaylightTime(cal.getTime())) {
                offset = tz.getRawOffset() + (tz.useDaylightTime()?3600000:0);
            } else {
                offset = tz.getRawOffset();
            }


            if(offset==0) {

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    for (int i = 0; i < ids.length; i++) {
      TimeZone tz = TimeZone.getTimeZone(ids[i]);
      
      addAbbreviation(array, tz, false);
      
      if (tz.useDaylightTime())
        addAbbreviation(array, tz, true);
    }
    
    return array;
  }

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    String []zoneIDs = TimeZone.getAvailableIDs(offset * 1000);
    
    for (int i = 0; i < zoneIDs.length; i++) {
      TimeZone zone = TimeZone.getTimeZone(zoneIDs[i]);


      if (isDST == zone.useDaylightTime())
        return StringValue.create(zoneIDs[i]);
    }


    return BooleanValue.FALSE;
  }

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        TimeZone tz = TimeZone.getDefault();


        tzname = new PyTuple(new PyString(tz.getDisplayName(false, 0)),
                             new PyString(tz.getDisplayName(true, 0)));


        daylight = tz.useDaylightTime() ? 1 : 0;
        timezone = -tz.getRawOffset() / 1000;
        altzone = timezone - tz.getDSTSavings() / 1000;
    }


    public static double time() {

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     * @param self a Date
     * @return the DST offset as a Duration.
     */
    public static Duration getDaylightSavingsOffset(Date self) {
        TimeZone timeZone = getTimeZone(self);
        int millis = (timeZone.useDaylightTime() && timeZone.inDaylightTime(self))
                ? timeZone.getDSTSavings() : 0;
        return new TimeDuration(0, 0, 0, millis);
    }


    public static Duration getDaylightSavingsOffset(BaseDuration self) {

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