Examples of org.jfree.date.SerialDate

org.jfree.date.SerialDate
An abstract class that defines our requirements for manipulating dates, without tying down a particular implementation.
Requirement 1 : match at least what Excel does for dates; Requirement 2 : class is immutable;
Why not just use java.util.Date? We will, when it makes sense. At times, java.util.Date can be *too* precise - it represents an instant in time, accurate to 1/1000th of a second (with the date itself depending on the time-zone). Sometimes we just want to represent a particular day (e.g. 21 January 2015) without concerning ourselves about the time of day, or the time-zone, or anything else. That's what we've defined SerialDate for.
You can call getInstance() to get a concrete subclass of SerialDate, without worrying about the exact implementation. @author David Gilbert


    /**
     * A test case for a reported bug, now fixed.
     */
    public void testAddMonthsTo5Oct2003() {
        final SerialDate d1 = SerialDate.createInstance(5, MonthConstants.OCTOBER, 2003);
        final SerialDate d2 = SerialDate.addMonths(2, d1);
        assertEquals(d2, SerialDate.createInstance(5, MonthConstants.DECEMBER, 2003));
    }

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    /**
     * A test case for a reported bug, now fixed.
     */
    public void testAddMonthsTo1Jan2003() {
        final SerialDate d1 = SerialDate.createInstance(1, MonthConstants.JANUARY, 2003);
        final SerialDate d2 = SerialDate.addMonths(0, d1);
        assertEquals(d2, d1);
    }

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    /**
     * Monday preceding Friday 9 November 2001 should be 5 November.
     */
    public void testMondayPrecedingFriday9Nov2001() {
        SerialDate mondayBefore = SerialDate.getPreviousDayOfWeek(
            SerialDate.MONDAY, this.nov9Y2001
        );
        assertEquals(5, mondayBefore.getDayOfMonth());
    }

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    /**
     * Monday following Friday 9 November 2001 should be 12 November.
     */
    public void testMondayFollowingFriday9Nov2001() {
        SerialDate mondayAfter = SerialDate.getFollowingDayOfWeek(
            SerialDate.MONDAY, this.nov9Y2001
        );
        assertEquals(12, mondayAfter.getDayOfMonth());
    }

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    /**
     * Monday nearest Friday 9 November 2001 should be 12 November.
     */
    public void testMondayNearestFriday9Nov2001() {
        SerialDate mondayNearest = SerialDate.getNearestDayOfWeek(
            SerialDate.MONDAY, this.nov9Y2001
        );
        assertEquals(12, mondayNearest.getDayOfMonth());
    }

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    /**
     * The Monday nearest to 22nd January 1970 falls on the 19th.
     */
    public void testMondayNearest22Jan1970() {
        SerialDate jan22Y1970 = SerialDate.createInstance(22, MonthConstants.JANUARY, 1970);
        SerialDate mondayNearest = SerialDate.getNearestDayOfWeek(SerialDate.MONDAY, jan22Y1970);
        assertEquals(19, mondayNearest.getDayOfMonth());
    }

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    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {


        SerialDate d1 = SerialDate.createInstance(15, 4, 2000);
        SerialDate d2 = null;


        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(d1);

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    /**
     * A test for bug report 1096282 (now fixed).
     */
    public void test1096282() {
        SerialDate d = SerialDate.createInstance(29, 2, 2004);
        d = SerialDate.addYears(1, d);
        SerialDate expected = SerialDate.createInstance(28, 2, 2005);
        assertTrue(d.isOn(expected));
    }

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    /**
     * Miscellaneous tests for the addMonths() method.
     */
    public void testAddMonths() {
        SerialDate d1 = SerialDate.createInstance(31, 5, 2004);
        
        SerialDate d2 = SerialDate.addMonths(1, d1);
        assertEquals(30, d2.getDayOfMonth());
        assertEquals(6, d2.getMonth());
        assertEquals(2004, d2.getYYYY());
        
        SerialDate d3 = SerialDate.addMonths(2, d1);
        assertEquals(31, d3.getDayOfMonth());
        assertEquals(7, d3.getMonth());
        assertEquals(2004, d3.getYYYY());
        
        SerialDate d4 = SerialDate.addMonths(1, SerialDate.addMonths(1, d1));
        assertEquals(30, d4.getDayOfMonth());
        assertEquals(7, d4.getMonth());
        assertEquals(2004, d4.getYYYY());
    }

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     */
    public RegularTimePeriod previous() {
        Day result;
        int serial = this.serialDate.toSerial();
        if (serial > SerialDate.SERIAL_LOWER_BOUND) {
            SerialDate yesterday = SerialDate.createInstance(serial - 1);
            return new Day(yesterday);
        }
        else {
            result = null;
        }

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