Hi all,
Not so long ago we decided to ditch all the Calendar stuff and use
Joda Time instead. But during testing our testers found a "bug" in de
code. It has to do with leapdays and adding years. The main question
is:
If today is 29-02, what day is it when I add one year? Is it 28-02 or 01-03?
We decided to try the Java GregorianCalendar against the two most
logical Joda Time chronologies:
-------------------------
Chronology greChrono = GregorianChronology.getInstance();
Chronology isoChrono = ISOChronology.getInstance();
DateMidnight gregorian = new DateMidnight(2004,2,29, greChrono );
DateMidnight iso = new DateMidnight(2004,2,29, isoChrono); //same as default
GregorianCalendar cal = (GregorianCalendar)gregorian.toCalendar(null);
//Add a year to gregoriancalendar:
cal.roll(GregorianCalendar.YEAR, true);
System.out.println("Gregorian Calendar:" + cal.getTime()); //Prints:
Gregorian Calendar:Tue Mar 01 00:00:00 CET 2005
//Add year to Joda:
gregorian = gregorian.plusYears(1);
System.out.println("JodaTime Gregorian: " + gregorian.toDate());
//Prints: JodaTime Gregorian: Mon Feb 28 00:00:00 CET 2005
iso = iso.plusYears(1);
System.out.println("JodaTime ISO: " + iso.toDate()); //Prints:
JodaTime ISO: Mon Feb 28 00:00:00 CET 2005
-------------------------
What is the correct method?
Our testers think 01-03 is correct :-(
Roy
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