Class MyDate

java.lang.Object

java.util.Calendar

java.util.GregorianCalendar

MyDate

All Implemented Interfaces:

Serializable, Cloneable, Comparable<Calendar>

public class MyDate
extends GregorianCalendar

This class extends GregorianCalendar, mostly to provide methods that make dealing with dates (without time of day) more convenient. Of course you can look at the API documentation for Calendar to see what methods MyDate inherits from Calendar. Note: MyDate's interface on Calendar uses month numbers 1,2,...,12, while Calendar itself uses 0,1,...,11. Beware of this if you try to use methods from the Calendar class!

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.Calendar

Calendar.Builder

Field Summary

Fields inherited from class java.util.GregorianCalendar

AD, BC

Fields inherited from class java.util.Calendar

ALL_STYLES, AM, AM_PM, APRIL, areFieldsSet, AUGUST, DATE, DAY_OF_MONTH, DAY_OF_WEEK, DAY_OF_WEEK_IN_MONTH, DAY_OF_YEAR, DECEMBER, DST_OFFSET, ERA, FEBRUARY, FIELD_COUNT, fields, FRIDAY, HOUR, HOUR_OF_DAY, isSet, isTimeSet, JANUARY, JULY, JUNE, LONG, LONG_FORMAT, LONG_STANDALONE, MARCH, MAY, MILLISECOND, MINUTE, MONDAY, MONTH, NARROW_FORMAT, NARROW_STANDALONE, NOVEMBER, OCTOBER, PM, SATURDAY, SECOND, SEPTEMBER, SHORT, SHORT_FORMAT, SHORT_STANDALONE, SUNDAY, THURSDAY, time, TUESDAY, UNDECIMBER, WEDNESDAY, WEEK_OF_MONTH, WEEK_OF_YEAR, YEAR, ZONE_OFFSET

Method Summary

Modifier and Type	Method and Description
MyDate	clone() Creates a new MyDate object identical to this.
int	daysUntil(MyDate d) Returns the number of days (with sign) between MyDate d and this.
int	getDay() Returns the year of this MyDate object.
int	getMonth() Returns the month of this MyDate object.
int	getYear() Returns the year of this MyDate object.
void	incDay(int k) Adds k days to the current date.
void	incMonth(int k) Adds k months to the current date.
void	incYear(int k) Adds k years to the current date.
static MyDate	makeDate(int y, int m, int d) Returns a new MyDate object initialized to thegiven year, month and day.
String	toString() Returns a String representation of this MyDate in the usual mm/dd/yyyy format.

Methods inherited from class java.util.GregorianCalendar

add, computeFields, computeTime, equals, from, getActualMaximum, getActualMinimum, getCalendarType, getGreatestMinimum, getGregorianChange, getLeastMaximum, getMaximum, getMinimum, getTimeZone, getWeeksInWeekYear, getWeekYear, hashCode, isLeapYear, isWeekDateSupported, roll, roll, setGregorianChange, setTimeZone, setWeekDate, toZonedDateTime

Methods inherited from class java.util.Calendar

after, before, clear, clear, compareTo, complete, get, getAvailableCalendarTypes, getAvailableLocales, getDisplayName, getDisplayNames, getFirstDayOfWeek, getInstance, getInstance, getInstance, getInstance, getMinimalDaysInFirstWeek, getTime, getTimeInMillis, internalGet, isLenient, isSet, set, set, set, set, setFirstDayOfWeek, setLenient, setMinimalDaysInFirstWeek, setTime, setTimeInMillis, toInstant

Methods inherited from class java.lang.Object

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

Method Detail

makeDate

public static MyDate makeDate(int y,
                              int m,
                              int d)

Returns a new MyDate object initialized to thegiven year, month and day. E.g.

MyDate dt = makeDate(2015,1,17); // makes 17 January 2015.

getYear

public int getYear()

Returns the year of this MyDate object. E.g. 2015

getMonth

public int getMonth()

Returns the month of this MyDate object. Result is in [1,2,...,12]

getDay

public int getDay()

Returns the year of this MyDate object. Result is in [1,2,...,31]

incYear

public void incYear(int k)

Adds k years to the current date. This MyDate object is modified!

incMonth

public void incMonth(int k)

Adds k months to the current date. This MyDate object is modified!

incDay

public void incDay(int k)

Adds k days to the current date. This MyDate object is modified!

clone

public MyDate clone()

Creates a new MyDate object identical to this. This is important because the increment methods modify the MyDate object on which they are called. So for example, after

MyDate A = makeDate(2015,3,18);
MyDate B = A;
B.incDay(3);

both A and B refer to the same MyDate object 3/21/2015. On the other hand, after

MyDate C = makeDate(2015,3,18);
MyDate D = C.clone();
D.incDay(3);

D refers to MyDate object 3/21/2015, while C refers to MyDate object 3/18/2015.

Overrides:

clone in class GregorianCalendar

toString

public String toString()

Returns a String representation of this MyDate in the usual mm/dd/yyyy format.

Overrides:

toString in class Calendar

daysUntil

public int daysUntil(MyDate d)

Returns the number of days (with sign) between MyDate d and this. For example

MyDate d1 = makeDate(2016,1,31);
MyDate d2 = makeDate(2016,2,1);
System.out.println(d1.daysUntil(d2));

outputs 1.