Examples of com.ibm.icu.util.GregorianCalendar

com.ibm.icu.util.GregorianCalendar
the supported ids for GMT-08:00 (Pacific Standard Time) String[] ids = TimeZone.getAvailableIDs(-8 * 60 * 60 * 1000); // if no ids were returned, something is wrong. get out. if (ids.length == 0) System.exit(0); // begin output System.out.println("Current Time"); // create a Pacific Standard Time time zone SimpleTimeZone pdt = new SimpleTimeZone(-8 * 60 * 60 * 1000, ids[0]); // set up rules for daylight savings time pdt.setStartRule(Calendar.MARCH, 2, Calendar.SUNDAY, 2 * 60 * 60 * 1000); pdt.setEndRule(Calendar.NOVEMBER, 1, Calendar.SUNDAY, 2 * 60 * 60 * 1000); // create a GregorianCalendar with the Pacific Daylight time zone // and the current date and time Calendar calendar = new GregorianCalendar(pdt); Date trialTime = new Date(); calendar.setTime(trialTime); // print out a bunch of interesting things System.out.println("ERA: " + calendar.get(Calendar.ERA)); System.out.println("YEAR: " + calendar.get(Calendar.YEAR)); System.out.println("MONTH: " + calendar.get(Calendar.MONTH)); System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR)); System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH)); System.out.println("DATE: " + calendar.get(Calendar.DATE)); System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH)); System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR)); System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK)); System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH)); System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM)); System.out.println("HOUR: " + calendar.get(Calendar.HOUR)); System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY)); System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE)); System.out.println("SECOND: " + calendar.get(Calendar.SECOND)); System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND)); System.out.println("ZONE_OFFSET: " + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); System.out.println("DST_OFFSET: " + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); System.out.println("Current Time, with hour reset to 3"); calendar.clear(Calendar.HOUR_OF_DAY); // so doesn't override calendar.set(Calendar.HOUR, 3); System.out.println("ERA: " + calendar.get(Calendar.ERA)); System.out.println("YEAR: " + calendar.get(Calendar.YEAR)); System.out.println("MONTH: " + calendar.get(Calendar.MONTH)); System.out.println("WEEK_OF_YEAR: " + calendar.get(Calendar.WEEK_OF_YEAR)); System.out.println("WEEK_OF_MONTH: " + calendar.get(Calendar.WEEK_OF_MONTH)); System.out.println("DATE: " + calendar.get(Calendar.DATE)); System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH)); System.out.println("DAY_OF_YEAR: " + calendar.get(Calendar.DAY_OF_YEAR)); System.out.println("DAY_OF_WEEK: " + calendar.get(Calendar.DAY_OF_WEEK)); System.out.println("DAY_OF_WEEK_IN_MONTH: " + calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH)); System.out.println("AM_PM: " + calendar.get(Calendar.AM_PM)); System.out.println("HOUR: " + calendar.get(Calendar.HOUR)); System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY)); System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE)); System.out.println("SECOND: " + calendar.get(Calendar.SECOND)); System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND)); System.out.println("ZONE_OFFSET: " + (calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000))); // in hours System.out.println("DST_OFFSET: " + (calendar.get(Calendar.DST_OFFSET)/(60*60*1000))); // in hours
GregorianCalendar usually should be instantiated using {@link com.ibm.icu.util.Calendar#getInstance(ULocale)} passing in a ULocalewith the tag "@calendar=gregorian".
@see Calendar @see TimeZone @author David Goldsmith, Mark Davis, Chen-Lieh Huang, Alan Liu @stable ICU 2.0

        final int kYear = 0;  // offset for dotNetDateTimeTicks[] field
        final int kMonth = 1;
        final int kDay = 2;
        final int kTicks = 3;
        final int kIncrement = 4;
        GregorianCalendar cal;
        long icuDate;
        long ticks, millis;
        int i;


        /* Open a proleptic Gregorian calendar. */
        long before0001AD = -1000000 * dayMillis;
        utc = new SimpleTimeZone(0, "UTC");
        cal = new GregorianCalendar(utc, Locale.ENGLISH);
        cal.setGregorianChange(new Date(before0001AD));
        for(i = 0; i < dotNetDateTimeTicks.length; i += kIncrement) {
            /* Test conversion from .Net/Universal time to ICU time. */
            millis = UniversalTimeScale.toLong(dotNetDateTimeTicks[i + kTicks], UniversalTimeScale.ICU4C_TIME);
            cal.clear();
            cal.set((int)dotNetDateTimeTicks[i + kYear],
                    (int)dotNetDateTimeTicks[i + kMonth] - 1, /* Java & ICU use January = month 0. */
                    (int)dotNetDateTimeTicks[i + kDay]);
            icuDate = cal.getTimeInMillis();
            if(millis != icuDate) {
                /* Print days not millis. */
                errln("UniversalTimeScale.toLong(ticks[" + i + "], ICU4C)=" +
                      (millis/dayMillis) + " != " + (icuDate/dayMillis) +
                      "=ucal_getMillis(" + dotNetDateTimeTicks[i + kYear] +

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            }
        }
    }
    public boolean isDateAtLeast(int year, int month, int day){
        Date now = new Date();
        Calendar c = new GregorianCalendar(year, month, day);
        Date dt = c.getTime();
        if(now.compareTo(dt)>=0){
            return true;
        }
        return false;
    }

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        }


        public long getTime(int year, int month, int dayOfMonth, int hour, int minute, int second) {
            long time;
            if (tzobj instanceof com.ibm.icu.util.TimeZone) {
                GregorianCalendar cal = new GregorianCalendar();
                cal.setTimeZone((com.ibm.icu.util.TimeZone)tzobj);
                cal.clear();
                cal.set(year, month, dayOfMonth, hour, minute, second);
                time = cal.getTimeInMillis();
            } else if (tzobj instanceof java.util.TimeZone) {
                java.util.GregorianCalendar cal = new java.util.GregorianCalendar();
                cal.setTimeZone((java.util.TimeZone)tzobj);
                cal.clear();
                cal.set(year, month, dayOfMonth, hour, minute, second);
                time = cal.getTimeInMillis();
            } else {
                throw new IllegalStateException("Unsupported TimeZone implementation");
            }
            return time;
        }

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    /**
     * Check isLeapYear for BC years.
     */
    public void Test4125881() {
        GregorianCalendar cal = (GregorianCalendar) Calendar.getInstance();
        DateFormat fmt = new SimpleDateFormat("MMMM d, yyyy G");
        cal.clear();
        for (int y=-20; y<=10; ++y) {
            cal.set(Calendar.ERA, y < 1 ? GregorianCalendar.BC : GregorianCalendar.AD);
            cal.set(Calendar.YEAR, y < 1 ? 1 - y : y);
            logln(y + " = " + fmt.format(cal.getTime()) + " " +
                               cal.isLeapYear(y));
            if (cal.isLeapYear(y) != ((y+40)%4 == 0))
                errln("Leap years broken");
        }
    }

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    /**
     * Prove that GregorianCalendar is proleptic (it used to cut off at 45 BC,
     * and not have leap years before then).
     */
    public void Test4125892() {
        GregorianCalendar cal = (GregorianCalendar) Calendar.getInstance();
        //DateFormat fmt = new SimpleDateFormat("MMMM d, yyyy G");
        //fmt = null;
        cal.clear();
        cal.set(Calendar.ERA, GregorianCalendar.BC);
        cal.set(Calendar.YEAR, 81); // 81 BC is a leap year (proleptically)
        cal.set(Calendar.MONTH, Calendar.FEBRUARY);
        cal.set(Calendar.DATE, 28);
        cal.add(Calendar.DATE, 1);
        if (cal.get(Calendar.DATE) != 29 ||
            !cal.isLeapYear(-80)) // -80 == 81 BC
            errln("Calendar not proleptic");
    }

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        if (a.getTimeZone()!= b.getTimeZone() && a.hashCode() == b.hashCode()) {
            errln("Calendar hash code ignores zone");
        }
        b.getTimeZone().setRawOffset(a.getTimeZone().getRawOffset());


        GregorianCalendar c = new GregorianCalendar();
        GregorianCalendar d = (GregorianCalendar)c.clone();
        if (c.hashCode() != d.hashCode()) {
            errln("GregorianCalendar hash code unequal for clones objects");
        }
        Date cutover = c.getGregorianChange();
        d.setGregorianChange(new Date(cutover.getTime() + 24*60*60*1000));
        if (c.hashCode() == d.hashCode()) {
            errln("GregorianCalendar hash code ignores cutover");
        }        
    }

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    /**
     * GregorianCalendar.equals() ignores cutover date
     */
    public void Test4141665() {
        GregorianCalendar cal = new GregorianCalendar();
        GregorianCalendar cal2 = (GregorianCalendar)cal.clone();
        Date cut = cal.getGregorianChange();
        Date cut2 = new Date(cut.getTime() + 100*24*60*60*1000L); // 100 days
                                                                  // later
        if (!cal.equals(cal2)) {
            errln("Cloned GregorianCalendars not equal");
        }
        cal2.setGregorianChange(cut2);
        if (cal.equals(cal2)) {
            errln("GregorianCalendar.equals() ignores cutover");
        }
    }

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    /**
     * Bug states that ArrayIndexOutOfBoundsException is thrown by
     * GregorianCalendar.roll() when IllegalArgumentException should be.
     */
    public void Test4142933() {
        GregorianCalendar calendar = new GregorianCalendar();
        try {
            calendar.roll(-1, true);
            errln("Test failed, no exception trown");
        }
        catch (IllegalArgumentException e) {
            // OK: Do nothing
            // logln("Test passed");

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     * other of these will wrap. We've modified the test given in the bug report
     * to therefore only check the behavior of a calendar with a zero raw offset
     * zone.
     */
    public void Test4145158() {
        GregorianCalendar calendar = new GregorianCalendar();


        calendar.setTimeZone(TimeZone.getTimeZone("GMT"));


        calendar.setTime(new Date(Long.MIN_VALUE));
        int year1 = calendar.get(Calendar.YEAR);
        int era1 = calendar.get(Calendar.ERA);
        
        calendar.setTime(new Date(Long.MAX_VALUE));
        int year2 = calendar.get(Calendar.YEAR);
        int era2 = calendar.get(Calendar.ERA);
        
        if (year1 == year2 && era1 == era2) {
            errln("Fail: Long.MIN_VALUE or Long.MAX_VALUE wrapping around");
        }
    }

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    /**
     * Maximum value for YEAR field wrong.
     */
    public void Test4145983() {
        GregorianCalendar calendar = new GregorianCalendar();
        calendar.setTimeZone(TimeZone.getTimeZone("GMT"));
        Date[] DATES = { new Date(Long.MAX_VALUE), new Date(Long.MIN_VALUE) };
        for (int i=0; i<DATES.length; ++i) {
            calendar.setTime(DATES[i]);
            int year = calendar.get(Calendar.YEAR);
            int maxYear = calendar.getMaximum(Calendar.YEAR);
            if (year > maxYear) {
                errln("Failed for "+DATES[i].getTime()+" ms: year=" +
                      year + ", maxYear=" + maxYear);
            }
        }

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