Current Quarter

This example will show how to find the current quarter from a given date using java date and java 8 date time API TemporalQuery.

Straight up Java

@Test
public void current_quarter_with_java() {

    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.MONTH, 3);
    
    int month = cal.get(Calendar.MONTH);
    int quarter = 0;

    // 3, 6, 9, 12
    if (month <= 3) {
        quarter = 1;
    } else if (month <= 6) {
        quarter = 2;
    } else if (month <= 9) {
        quarter = 3;
    } else {
        quarter = 4;
    }
    
    assertEquals(1, quarter);
}

Java 8 Date and Time API

Java 8 TemporalQuery interface with the queryFrom(TemporalAccessor) method allows for a way to extract information from a temporal object. The queryFrom method compares the passed-in date against the ChronoField.MONTH_OF_YEAR then returning the appropriate quarter of year.

Note: This example is purely for demonstration as the java 8 time api provides YearMonth.from(temporal).get(IsoFields.QUARTER_OF_YEAR) to get the current quarter of year.

@Test
public void current_quarter_with_java8() {

    LocalDate date = LocalDate.of(2014, 02, 01);
    
    Integer quarter = date.query(new Quarter());

    assertEquals(new Integer(1), quarter);
}

/**
 * Methods returns the proper quarter based on the date passed
 */
class Quarter implements TemporalQuery<Integer> {

    @Override
    public Integer queryFrom(TemporalAccessor date) {
        
        int month = date.get(ChronoField.MONTH_OF_YEAR);
        
        if (month <= 3) {
            return new Integer(1);
        } else if (month <= 6) {
            return new Integer(2);
        } else if (month <= 9) {
            return new Integer(3);
        } else {
            return new Integer(4);
        }
    }
}