org.jfree.date

Class SpreadsheetDate

java.lang.Object

org.jfree.date.SerialDate

org.jfree.date.SpreadsheetDate

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable, MonthConstants

public class SpreadsheetDate
extends SerialDate

Represents a date using an integer, in a similar fashion to the implementation in Microsoft Excel. The range of dates supported is 1-Jan-1900 to 31-Dec-9999.

Be aware that there is a deliberate bug in Excel that recognises the year 1900 as a leap year when in fact it is not a leap year. You can find more information on the Microsoft website in article Q181370:

http://support.microsoft.com/support/kb/articles/Q181/3/70.asp

Excel uses the convention that 1-Jan-1900 = 1. This class uses the convention 1-Jan-1900 = 2. The result is that the day number in this class will be different to the Excel figure for January and February 1900...but then Excel adds in an extra day (29-Feb-1900 which does not actually exist!) and from that point forward the day numbers will match.

Author:

David Gilbert

See Also:

Serialized Form

Field Summary

Fields inherited from class org.jfree.date.SerialDate

AGGREGATE_DAYS_TO_END_OF_MONTH, AGGREGATE_DAYS_TO_END_OF_PRECEDING_MONTH, DATE_FORMAT_SYMBOLS, FIRST_WEEK_IN_MONTH, FOLLOWING, FOURTH_WEEK_IN_MONTH, FRIDAY, INCLUDE_BOTH, INCLUDE_FIRST, INCLUDE_NONE, INCLUDE_SECOND, LAST_DAY_OF_MONTH, LAST_WEEK_IN_MONTH, LEAP_YEAR_AGGREGATE_DAYS_TO_END_OF_MONTH, LEAP_YEAR_AGGREGATE_DAYS_TO_END_OF_PRECEDING_MONTH, MAXIMUM_YEAR_SUPPORTED, MINIMUM_YEAR_SUPPORTED, MONDAY, NEAREST, PRECEDING, SATURDAY, SECOND_WEEK_IN_MONTH, SERIAL_LOWER_BOUND, SERIAL_UPPER_BOUND, SUNDAY, THIRD_WEEK_IN_MONTH, THURSDAY, TUESDAY, WEDNESDAY

Fields inherited from interface org.jfree.date.MonthConstants

APRIL, AUGUST, DECEMBER, FEBRUARY, JANUARY, JULY, JUNE, MARCH, MAY, NOVEMBER, OCTOBER, SEPTEMBER

Constructor Summary

Constructors

Constructor and Description
SpreadsheetDate(int serial) Standard constructor - creates a new date object representing the specified day number (which should be in the range 2 to 2958465.
SpreadsheetDate(int day, int month, int year) Creates a new date instance.

Method Summary

Modifier and Type	Method and Description
int	compare(SerialDate other) Returns the difference (in days) between this date and the specified 'other' date.
int	compareTo(java.lang.Object other) Implements the method required by the Comparable interface.
boolean	equals(java.lang.Object object) Tests the equality of this date with an arbitrary object.
int	getDayOfMonth() Returns the day of the month.
int	getDayOfWeek() Returns a code representing the day of the week.
int	getMonth() Returns the month (January = 1, February = 2, March = 3).
int	getYYYY() Returns the year (assume a valid range of 1900 to 9999).
int	hashCode() Returns a hash code for this object instance.
boolean	isAfter(SerialDate other) Returns true if this SerialDate represents the same date as the specified SerialDate.
boolean	isBefore(SerialDate other) Returns true if this SerialDate represents an earlier date compared to the specified SerialDate.
boolean	isInRange(SerialDate d1, SerialDate d2) Returns true if this SerialDate is within the specified range (INCLUSIVE).
boolean	isInRange(SerialDate d1, SerialDate d2, int include) Returns true if this SerialDate is within the specified range (caller specifies whether or not the end-points are included).
boolean	isOn(SerialDate other) Returns true if this SerialDate represents the same date as the specified SerialDate.
boolean	isOnOrAfter(SerialDate other) Returns true if this SerialDate represents the same date as the specified SerialDate.
boolean	isOnOrBefore(SerialDate other) Returns true if this SerialDate represents the same date as the specified SerialDate.
java.util.Date	toDate() Returns a java.util.Date equivalent to this date.
int	toSerial() Returns the serial number for the date, where 1 January 1900 = 2 (this corresponds, almost, to the numbering system used in Microsoft Excel for Windows and Lotus 1-2-3).

Methods inherited from class org.jfree.date.SerialDate

addDays, addMonths, addYears, createInstance, createInstance, createInstance, getDescription, getEndOfCurrentMonth, getFollowingDayOfWeek, getFollowingDayOfWeek, getMonths, getMonths, getNearestDayOfWeek, getNearestDayOfWeek, getPreviousDayOfWeek, getPreviousDayOfWeek, isLeapYear, isValidMonthCode, isValidWeekdayCode, isValidWeekInMonthCode, lastDayOfMonth, leapYearCount, monthCodeToQuarter, monthCodeToString, monthCodeToString, relativeToString, setDescription, stringToMonthCode, stringToWeekdayCode, toString, weekdayCodeToString, weekInMonthToString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SpreadsheetDate

public SpreadsheetDate(int day,
                       int month,
                       int year)

Creates a new date instance.

Parameters:

day - the day (in the range 1 to 28/29/30/31).

month - the month (in the range 1 to 12).

year - the year (in the range 1900 to 9999).

SpreadsheetDate

public SpreadsheetDate(int serial)

Standard constructor - creates a new date object representing the specified day number (which should be in the range 2 to 2958465.

Parameters:

serial - the serial number for the day (range: 2 to 2958465).

Method Detail

toSerial

public int toSerial()

Returns the serial number for the date, where 1 January 1900 = 2 (this corresponds, almost, to the numbering system used in Microsoft Excel for Windows and Lotus 1-2-3).

Specified by:

toSerial in class SerialDate

Returns:

The serial number of this date.

toDate

public java.util.Date toDate()

Returns a java.util.Date equivalent to this date.

Specified by:

toDate in class SerialDate

Returns:

The date.

getYYYY

public int getYYYY()

Returns the year (assume a valid range of 1900 to 9999).

Specified by:

getYYYY in class SerialDate

Returns:

The year.

getMonth

public int getMonth()

Returns the month (January = 1, February = 2, March = 3).

Specified by:

getMonth in class SerialDate

Returns:

The month of the year.

getDayOfMonth

public int getDayOfMonth()

Returns the day of the month.

Specified by:

getDayOfMonth in class SerialDate

Returns:

The day of the month.

getDayOfWeek

public int getDayOfWeek()

Returns a code representing the day of the week.

The codes are defined in the SerialDate class as: SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, and SATURDAY.

Specified by:

getDayOfWeek in class SerialDate

Returns:

A code representing the day of the week.

equals

public boolean equals(java.lang.Object object)

Tests the equality of this date with an arbitrary object.

This method will return true ONLY if the object is an instance of the SerialDate base class, and it represents the same day as this SpreadsheetDate.

Overrides:

equals in class java.lang.Object

Parameters:

object - the object to compare (null permitted).

Returns:

A boolean.

hashCode

public int hashCode()

Returns a hash code for this object instance.

Overrides:

hashCode in class java.lang.Object

Returns:

A hash code.

compare

public int compare(SerialDate other)

Returns the difference (in days) between this date and the specified 'other' date.

Specified by:

compare in class SerialDate

Parameters:

other - the date being compared to.

Returns:

The difference (in days) between this date and the specified 'other' date.

compareTo

public int compareTo(java.lang.Object other)

Implements the method required by the Comparable interface.

Parameters:

other - the other object (usually another SerialDate).

Returns:

A negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.

isOn

public boolean isOn(SerialDate other)

Returns true if this SerialDate represents the same date as the specified SerialDate.

Specified by:

isOn in class SerialDate

Parameters:

other - the date being compared to.

Returns:

true if this SerialDate represents the same date as the specified SerialDate.

isBefore

public boolean isBefore(SerialDate other)

Returns true if this SerialDate represents an earlier date compared to the specified SerialDate.

Specified by:

isBefore in class SerialDate

Parameters:

other - the date being compared to.

Returns:

true if this SerialDate represents an earlier date compared to the specified SerialDate.

isOnOrBefore

public boolean isOnOrBefore(SerialDate other)

Returns true if this SerialDate represents the same date as the specified SerialDate.

Specified by:

isOnOrBefore in class SerialDate

Parameters:

other - the date being compared to.

Returns:

true if this SerialDate represents the same date as the specified SerialDate.

isAfter

public boolean isAfter(SerialDate other)

Returns true if this SerialDate represents the same date as the specified SerialDate.

Specified by:

isAfter in class SerialDate

Parameters:

other - the date being compared to.

Returns:

true if this SerialDate represents the same date as the specified SerialDate.

isOnOrAfter

public boolean isOnOrAfter(SerialDate other)

Returns true if this SerialDate represents the same date as the specified SerialDate.

Specified by:

isOnOrAfter in class SerialDate

Parameters:

other - the date being compared to.

Returns:

true if this SerialDate represents the same date as the specified SerialDate.

isInRange

public boolean isInRange(SerialDate d1,
                         SerialDate d2)

Returns true if this SerialDate is within the specified range (INCLUSIVE). The date order of d1 and d2 is not important.

Specified by:

isInRange in class SerialDate

Parameters:

d1 - a boundary date for the range.

d2 - the other boundary date for the range.

Returns:

A boolean.

isInRange

public boolean isInRange(SerialDate d1,
                         SerialDate d2,
                         int include)

Returns true if this SerialDate is within the specified range (caller specifies whether or not the end-points are included). The order of d1 and d2 is not important.

Specified by:

isInRange in class SerialDate

Parameters:

d1 - one boundary date for the range.

d2 - a second boundary date for the range.

include - a code that controls whether or not the start and end dates are included in the range.

Returns:

true if this SerialDate is within the specified range.