Examples of org.joda.time.DateTime.withFieldAdded()

org.joda.time.DateTime.withFieldAdded()
Returns a copy of this datetime with the value of the specified field increased.
If the addition is zero or the field is null, then this is returned.
These three lines are equivalent:
```
 DateTime added = dt.withFieldAdded(DurationFieldType.years(), 6); DateTime added = dt.plusYears(6); DateTime added = dt.plus(Period.years(6)); 
```
@param fieldType the field type to add to, not null @param amount the amount to add @return a copy of this datetime with the field updated @throws IllegalArgumentException if the value is null or invalid @throws ArithmeticException if the new datetime exceeds the capacity of a long


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


        DurationField field = type.getField(GJChronology.getInstance(DateTimeZone.UTC));
        int diff = field.getDifference(dtEnd.getMillis(), dtStart.getMillis());
        assertEquals(amt, diff);

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    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);

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


        DurationField field = type.getField(GJChronology.getInstance(DateTimeZone.UTC));
        int diff = field.getDifference(dtEnd.getMillis(), dtStart.getMillis());
        assertEquals(amt, diff);

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    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);

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