Examples of org.joda.time.DateTime

org.joda.time.DateTime
DateTime is the standard implementation of an unmodifiable datetime class.
DateTime is the most widely used implementation of {@link ReadableInstant}. As with all instants, it represents an exact point on the time-line, but limited to the precision of milliseconds. A DateTime calculates its fields with respect to a {@link DateTimeZone time zone}.
Internally, the class holds two pieces of data. Firstly, it holds the datetime as milliseconds from the Java epoch of 1970-01-01T00:00:00Z. Secondly, it holds a {@link Chronology} which determines how themillisecond instant value is converted into the date time fields. The default Chronology is {@link ISOChronology} which is the agreedinternational standard and compatible with the modern Gregorian calendar.
Each individual field can be queried in two ways:
- getHourOfDay()
- hourOfDay().get()
The second technique also provides access to other useful methods on the field:
- numeric value
- text value
- short text value
- maximum/minimum values
- add/subtract
- set
- rounding
DateTime is thread-safe and immutable, provided that the Chronology is as well. All standard Chronology classes supplied are thread-safe and immutable. @author Stephen Colebourne @author Kandarp Shah @author Brian S O'Neill @since 1.0 @see MutableDateTime

            millis += SKIP;
        }
    }


    public void testSampleDate1() {
        DateTime dt = new DateTime(1945, 11, 12, 0, 0, 0, 0, ISO_UTC);
        dt = dt.withChronology(ISLAMIC_UTC);
        assertEquals(IslamicChronology.AH, dt.getEra());
        assertEquals(14, dt.getCenturyOfEra());  // TODO confirm
        assertEquals(64, dt.getYearOfCentury());
        assertEquals(1364, dt.getYearOfEra());
        
        assertEquals(1364, dt.getYear());
        Property fld = dt.year();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(DurationFieldType.days(), fld.getLeapDurationField().getType());
        assertEquals(new DateTime(1365, 12, 6, 0, 0, 0, 0, ISLAMIC_UTC), fld.addToCopy(1));
        
        assertEquals(12, dt.getMonthOfYear());
        fld = dt.monthOfYear();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(DurationFieldType.days(), fld.getLeapDurationField().getType());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(12, fld.getMaximumValue());
        assertEquals(12, fld.getMaximumValueOverall());
        assertEquals(new DateTime(1365, 1, 6, 0, 0, 0, 0, ISLAMIC_UTC), fld.addToCopy(1));
        assertEquals(new DateTime(1364, 1, 6, 0, 0, 0, 0, ISLAMIC_UTC), fld.addWrapFieldToCopy(1));
        
        assertEquals(6, dt.getDayOfMonth());
        fld = dt.dayOfMonth();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(null, fld.getLeapDurationField());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(29, fld.getMaximumValue());
        assertEquals(30, fld.getMaximumValueOverall());
        assertEquals(new DateTime(1364, 12, 7, 0, 0, 0, 0, ISLAMIC_UTC), fld.addToCopy(1));
        
        assertEquals(DateTimeConstants.MONDAY, dt.getDayOfWeek());
        fld = dt.dayOfWeek();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(null, fld.getLeapDurationField());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(7, fld.getMaximumValue());
        assertEquals(7, fld.getMaximumValueOverall());
        assertEquals(new DateTime(1364, 12, 7, 0, 0, 0, 0, ISLAMIC_UTC), fld.addToCopy(1));
        
        assertEquals(6 * 30 + 5 * 29 + 6, dt.getDayOfYear());
        fld = dt.dayOfYear();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(null, fld.getLeapDurationField());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(354, fld.getMaximumValue());
        assertEquals(355, fld.getMaximumValueOverall());
        assertEquals(new DateTime(1364, 12, 7, 0, 0, 0, 0, ISLAMIC_UTC), fld.addToCopy(1));
        
        assertEquals(0, dt.getHourOfDay());
        assertEquals(0, dt.getMinuteOfHour());
        assertEquals(0, dt.getSecondOfMinute());
        assertEquals(0, dt.getMillisOfSecond());
    }

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        assertEquals(0, dt.getSecondOfMinute());
        assertEquals(0, dt.getMillisOfSecond());
    }


    public void testSampleDate2() {
        DateTime dt = new DateTime(2005, 11, 26, 0, 0, 0, 0, ISO_UTC);
        dt = dt.withChronology(ISLAMIC_UTC);
        assertEquals(IslamicChronology.AH, dt.getEra());
        assertEquals(15, dt.getCenturyOfEra());  // TODO confirm
        assertEquals(26, dt.getYearOfCentury());
        assertEquals(1426, dt.getYearOfEra());
        
        assertEquals(1426, dt.getYear());
        Property fld = dt.year();
        assertEquals(true, fld.isLeap());
        assertEquals(1, fld.getLeapAmount());
        assertEquals(DurationFieldType.days(), fld.getLeapDurationField().getType());
        
        assertEquals(10, dt.getMonthOfYear());
        fld = dt.monthOfYear();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(DurationFieldType.days(), fld.getLeapDurationField().getType());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(12, fld.getMaximumValue());
        assertEquals(12, fld.getMaximumValueOverall());
        
        assertEquals(24, dt.getDayOfMonth());
        fld = dt.dayOfMonth();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(null, fld.getLeapDurationField());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(29, fld.getMaximumValue());
        assertEquals(30, fld.getMaximumValueOverall());
        
        assertEquals(DateTimeConstants.SATURDAY, dt.getDayOfWeek());
        fld = dt.dayOfWeek();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(null, fld.getLeapDurationField());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(7, fld.getMaximumValue());
        assertEquals(7, fld.getMaximumValueOverall());
        
        assertEquals(5 * 30 + 4 * 29 + 24, dt.getDayOfYear());
        fld = dt.dayOfYear();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(null, fld.getLeapDurationField());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(355, fld.getMaximumValue());
        assertEquals(355, fld.getMaximumValueOverall());
        
        assertEquals(0, dt.getHourOfDay());
        assertEquals(0, dt.getMinuteOfHour());
        assertEquals(0, dt.getSecondOfMinute());
        assertEquals(0, dt.getMillisOfSecond());
    }

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        assertEquals(0, dt.getSecondOfMinute());
        assertEquals(0, dt.getMillisOfSecond());
    }


    public void testSampleDate3() {
        DateTime dt = new DateTime(1426, 12, 24, 0, 0, 0, 0, ISLAMIC_UTC);
        assertEquals(IslamicChronology.AH, dt.getEra());
        
        assertEquals(1426, dt.getYear());
        Property fld = dt.year();
        assertEquals(true, fld.isLeap());
        assertEquals(1, fld.getLeapAmount());
        assertEquals(DurationFieldType.days(), fld.getLeapDurationField().getType());
        
        assertEquals(12, dt.getMonthOfYear());
        fld = dt.monthOfYear();
        assertEquals(true, fld.isLeap());
        assertEquals(1, fld.getLeapAmount());
        assertEquals(DurationFieldType.days(), fld.getLeapDurationField().getType());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(12, fld.getMaximumValue());
        assertEquals(12, fld.getMaximumValueOverall());
        
        assertEquals(24, dt.getDayOfMonth());
        fld = dt.dayOfMonth();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(null, fld.getLeapDurationField());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(30, fld.getMaximumValue());
        assertEquals(30, fld.getMaximumValueOverall());
        
        assertEquals(DateTimeConstants.TUESDAY, dt.getDayOfWeek());
        fld = dt.dayOfWeek();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(null, fld.getLeapDurationField());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(7, fld.getMaximumValue());
        assertEquals(7, fld.getMaximumValueOverall());
        
        assertEquals(6 * 30 + 5 * 29 + 24, dt.getDayOfYear());
        fld = dt.dayOfYear();
        assertEquals(false, fld.isLeap());
        assertEquals(0, fld.getLeapAmount());
        assertEquals(null, fld.getLeapDurationField());
        assertEquals(1, fld.getMinimumValue());
        assertEquals(1, fld.getMinimumValueOverall());
        assertEquals(355, fld.getMaximumValue());
        assertEquals(355, fld.getMaximumValueOverall());
        
        assertEquals(0, dt.getHourOfDay());
        assertEquals(0, dt.getMinuteOfHour());
        assertEquals(0, dt.getSecondOfMinute());
        assertEquals(0, dt.getMillisOfSecond());
    }

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        assertEquals(0, dt.getSecondOfMinute());
        assertEquals(0, dt.getMillisOfSecond());
    }


    public void testSampleDateWithZone() {
        DateTime dt = new DateTime(2005, 11, 26, 12, 0, 0, 0, PARIS).withChronology(ISLAMIC_UTC);
        assertEquals(IslamicChronology.AH, dt.getEra());
        assertEquals(1426, dt.getYear());
        assertEquals(10, dt.getMonthOfYear());
        assertEquals(24, dt.getDayOfMonth());
        assertEquals(11, dt.getHourOfDay());  // PARIS is UTC+1 in summer (12-1=11)
        assertEquals(0, dt.getMinuteOfHour());
        assertEquals(0, dt.getSecondOfMinute());
        assertEquals(0, dt.getMillisOfSecond());
    }

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        testAdd("1580-10-15", DurationFieldType.months(), 48, "1584-10-15");
        testAdd("1580-12-31", DurationFieldType.months(), 48, "1584-12-31");
    }


    private void testAdd(String start, DurationFieldType type, int amt, String end) {
        DateTime dtStart = new DateTime(start, ISOChronology.getInstanceUTC());
        DateTime dtEnd = new DateTime(end, ISOChronology.getInstanceUTC());
        assertEquals(dtEnd, dtStart.withFieldAdded(type, amt));
        assertEquals(dtStart, dtEnd.withFieldAdded(type, -amt));


        DurationField field = type.getField(ISOChronology.getInstanceUTC());
        int diff = field.getDifference(dtEnd.getMillis(), dtStart.getMillis());
        assertEquals(amt, diff);
        
        if (type == DurationFieldType.years() ||
            type == DurationFieldType.months() ||
            type == DurationFieldType.days()) {

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        }
    }


    public void testLeap_28feb() {
        Chronology chrono = ISOChronology.getInstance();
        DateTime dt = new DateTime(2012, 2, 28, 0, 0, chrono);
        assertEquals(true, dt.year().isLeap());
        assertEquals(true, dt.monthOfYear().isLeap());
        assertEquals(false, dt.dayOfMonth().isLeap());
        assertEquals(false, dt.dayOfYear().isLeap());
    }

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        assertEquals(false, dt.dayOfYear().isLeap());
    }


    public void testLeap_29feb() {
        Chronology chrono = ISOChronology.getInstance();
        DateTime dt = new DateTime(2012, 2, 29, 0, 0, chrono);
        assertEquals(true, dt.year().isLeap());
        assertEquals(true, dt.monthOfYear().isLeap());
        assertEquals(true, dt.dayOfMonth().isLeap());
        assertEquals(true, dt.dayOfYear().isLeap());
    }

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        assertEquals(expected, date.weekyear().addToCopy(-2004));
    }


    //-----------------------------------------------------------------------
    public void test_cutoverPreZero() {
        DateTime cutover = new LocalDate(-2, 6, 30, ISOChronology.getInstanceUTC()).toDateTimeAtStartOfDay(DateTimeZone.UTC);
        try {
            GJChronology.getInstance(DateTimeZone.UTC, cutover);
            fail();
        } catch (IllegalArgumentException ex) {
            // expected

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        assertEquals(true, ethiopic.millisOfSecond().isSupported());
    }


    //-----------------------------------------------------------------------
    public void testEpoch() {
        DateTime epoch = new DateTime(1, 1, 1, 0, 0, 0, 0, ETHIOPIC_UTC);
        assertEquals(new DateTime(8, 8, 29, 0, 0, 0, 0, JULIAN_UTC), epoch.withChronology(JULIAN_UTC));
    }

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    }


    public void testEra() {
        assertEquals(1, EthiopicChronology.EE);
        try {
            new DateTime(-1, 13, 5, 0, 0, 0, 0, ETHIOPIC_UTC);
            fail();
        } catch (IllegalArgumentException ex) {}
    }

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