Examples of com.ibm.icu.util.TimeZone

com.ibm.icu.util.TimeZone
TimeZone represents a time zone offset, and also figures out daylight savings.
Typically, you get a TimeZone using getDefault which creates a TimeZone based on the time zone where the program is running. For example, for a program running in Japan, getDefault creates a TimeZone object based on Japanese Standard Time.
You can also get a TimeZone using getTimeZone along with a time zone ID. For instance, the time zone ID for the U.S. Pacific Time zone is "America/Los_Angeles". So, you can get a U.S. Pacific Time TimeZone object with:
```
 TimeZone tz = TimeZone.getTimeZone("America/Los_Angeles"); 
```
You can use getAvailableIDs method to iterate through all the supported time zone IDs. You can then choose a supported ID to get a TimeZone. If the time zone you want is not represented by one of the supported IDs, then you can create a custom time zone ID with the following syntax:
```
 GMT[+|-]hh[[:]mm] 
```
For example, you might specify GMT+14:00 as a custom time zone ID. The TimeZone that is returned when you specify a custom time zone ID does not include daylight savings time.
For compatibility with JDK 1.1.x, some other three-letter time zone IDs (such as "PST", "CTT", "AST") are also supported. However, their use is deprecated because the same abbreviation is often used for multiple time zones (for example, "CST" could be U.S. "Central Standard Time" and "China Standard Time"), and the Java platform can then only recognize one of them. @see Calendar @see GregorianCalendar @see SimpleTimeZone @author Mark Davis, David Goldsmith, Chen-Lieh Huang, Alan Liu @stable ICU 2.0

    /*
     * Test method for 'com.ibm.icu.text.DateFormat.getTimeZone()'
     */
    public final void testGetTimeZone() {
        DateFormat df = DateFormat.getTimeInstance(DateFormat.SHORT);
        TimeZone tz = TimeZone.getTimeZone("EST");
        df.setTimeZone(tz);
        assertEquals(tz, df.getTimeZone());
    }

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        LinkedList vector = new LinkedList();
        for (int i=0; i<OLSON_ZONE_COUNT; ++i) {
            String unistr;
            if ((unistr=getID(i))!=null) {
                // This is VERY inefficient.
                TimeZone z = TimeZone.getTimeZone(unistr);
                // Make sure we get back the ID we wanted (if the ID is
                // invalid we get back GMT).
                if (z != null && z.getID().equals(unistr) &&
                    z.getRawOffset() == offset) {
                    vector.add(unistr);
                }
            }
        }
        if(!vector.isEmpty()){

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     * Lookup the given name in our system zone table.  If found,
     * instantiate a new zone of that name and return it.  If not
     * found, return 0.
     */
    public static TimeZone getSystemTimeZone(String id) {
        TimeZone z = (TimeZone)zoneCache.get(id);
        if (z == null) {
            try{
                UResourceBundle top = UResourceBundle.getBundleInstance(ICUResourceBundle.ICU_BASE_NAME, "zoneinfo", ICUResourceBundle.ICU_DATA_CLASS_LOADER);
                UResourceBundle res = openOlsonResource(id);
                z = new OlsonTimeZone(top, res);
                z.setID(id);
                zoneCache.put(id, z);
            }catch(Exception ex){
                return null;
            }
        }
        return (TimeZone)z.clone();
    }

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        }
        return (TimeZone)z.clone();
    }
    
    public static TimeZone getGMT(){
        TimeZone z = new SimpleTimeZone(0, kGMT_ID);
        z.setID(kGMT_ID);
        return z;
    }

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    {
        String[] ZONES = { "GMT", "MET", "IST" };


        public Object[] getTestObjects()
        {
            TimeZone zones[] = new TimeZone[ZONES.length];
            
            for(int z = 0; z < ZONES.length; z += 1) {
                zones[z] = TimeZone.getTimeZone(ZONES[z]);
            }

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            return zones;
        }
        
        public boolean hasSameBehavior(Object a, Object b)
        {
            TimeZone zone_a = (TimeZone) a;
            TimeZone zone_b = (TimeZone) b;


            if (!(zone_a.getDisplayName().equals(zone_b.getDisplayName()))) {
                return false;
            }


            int a_offsets[] = {0, 0};
            int b_offsets[] = {0, 0};


            boolean bSame = true;
            for (int i = 0; i < sampleTimes.length; i++) {
                zone_a.getOffset(sampleTimes[i], false, a_offsets);
                zone_b.getOffset(sampleTimes[i], false, b_offsets);
                if (a_offsets[0] != b_offsets[0] || a_offsets[1] != b_offsets[1]) {
                    bSame = false;
                    break;
                }
            }

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            // This bug actually occurs on Windows NT as well, and doesn't
            // require the host zone to be set; it can be set in Java.
            String[] ids = TimeZone.getAvailableIDs();
            boolean bad = false;
            for (int i=0; i<ids.length; ++i) {
                TimeZone zone = TimeZone.getTimeZone(ids[i]);
                GregorianCalendar cal = new GregorianCalendar(zone);
                cal.clear();
                cal.set(1900, 15, 5, 5, 8, 13);
                if (cal.get(Calendar.HOUR) != 5) {
                    logln("Fail: " + zone.getID() + " " +
                          zone.useDaylightTime() + "; DST_OFFSET = " +
                          cal.get(Calendar.DST_OFFSET) / (60*60*1000.0) + "; ZONE_OFFSET = " +
                          cal.get(Calendar.ZONE_OFFSET) / (60*60*1000.0) + "; getRawOffset() = " +
                          zone.getRawOffset() / (60*60*1000.0) +
                          "; HOUR = " + cal.get(Calendar.HOUR));
                    cal.clear();
                    cal.set(1900, 15, 5, 5, 8, 13);
                    if (cal.get(Calendar.HOUR) != 5) {
                        logln("Fail: " + zone.getID() + " " +
                              zone.useDaylightTime() + "; DST_OFFSET = " +
                              cal.get(Calendar.DST_OFFSET) / (60*60*1000.0) + "; ZONE_OFFSET = " +
                              cal.get(Calendar.ZONE_OFFSET) / (60*60*1000.0) + "; getRawOffset() = " +
                              zone.getRawOffset() / (60*60*1000.0) +
                              "; HOUR = " + cal.get(Calendar.HOUR));
                        cal.clear();
                        cal.set(1900, 15, 5, 5, 8, 13);
                        logln("ms = " + cal.getTime() + " (" + cal.getTime().getTime() + ")");
                        cal.get(Calendar.HOUR);
                        java.util.GregorianCalendar cal2 = new java.util.GregorianCalendar(java.util.TimeZone.getTimeZone(ids[i]));
                        cal2.clear();
                        cal2.set(1900, 15, 5, 5, 8, 13);
                        cal2.get(Calendar.HOUR);
                        logln("java.util.GC: " + zone.getID() + " " +
                            zone.useDaylightTime() + "; DST_OFFSET = " +
                            cal2.get(Calendar.DST_OFFSET) / (60*60*1000.0) + "; ZONE_OFFSET = " +
                            cal2.get(Calendar.ZONE_OFFSET) / (60*60*1000.0) + "; getRawOffset() = " +
                            zone.getRawOffset() / (60*60*1000.0) +
                            "; HOUR = " + cal.get(Calendar.HOUR));
                        logln("ms = " + cal2.getTime() + " (" + cal2.getTime().getTime() + ")");
                        bad = true;
                    } else if (false) { // Change to true to debug
                        logln("OK: " + zone.getID() + " " +
                              zone.useDaylightTime() + " " +
                              cal.get(Calendar.DST_OFFSET) / (60*60*1000) + " " +
                              zone.getRawOffset() / (60*60*1000) +
                              ": HOUR = " + cal.get(Calendar.HOUR));
                    }
                }
                if (bad) errln("TimeZone problems with GC");
            }

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            // work around bug for jdk1.4 on solaris 2.6, which uses funky
            // timezone names
            // jdk1.4.1 will drop support for 2.6 so we should be ok when it
            // comes out
            java.util.TimeZone javazone = java.util.TimeZone.getTimeZone("GMT");
            TimeZone icuzone = TimeZone.getTimeZone("GMT");


            GregorianCalendar gc = new GregorianCalendar(icuzone);
            
            gc.set(1997, 3, 1, 15, 16, 17); // April 1, 1997

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    public void Test4071385() {
    // work around bug for jdk1.4 on solaris 2.6, which uses funky timezone
    // names
    // jdk1.4.1 will drop support for 2.6 so we should be ok when it comes out
    java.util.TimeZone javazone = java.util.TimeZone.getTimeZone("GMT");
    TimeZone icuzone = TimeZone.getTimeZone("GMT");


        Calendar cal = Calendar.getInstance(icuzone);
        java.util.Calendar tempcal = java.util.Calendar.getInstance(javazone);
        tempcal.clear();
        tempcal.set(1998, Calendar.JUNE, 24);

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            testday != 28)
            errln("Fail: Calendar not initialized");
    }


    public void Test4083167() {
        TimeZone saveZone = TimeZone.getDefault();
        try {
            TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
            Date firstDate = new Date();
            Calendar cal = new GregorianCalendar();
            cal.setTime(firstDate);

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