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fpavageau/gist:4654628

Created January 28, 2013 10:59
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Where you realize java.util.Calendar.add() is not commutative
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gistfile1.java
Calendar cal1 = new GregorianCalendar(2013, Calendar.JANUARY, 28);
Calendar cal2 = new GregorianCalendar(2013, Calendar.JANUARY, 28);
Calendar cal3 = new GregorianCalendar(2013, Calendar.JANUARY, 28);
cal1.add(Calendar.DAY_OF_MONTH, 1);
cal1.add(Calendar.MONTH, 1);
cal2.add(Calendar.MONTH, 1);
cal2.add(Calendar.DAY_OF_MONTH, 1);
cal3.add(Calendar.MONTH, 1);
System.out.println(cal1.getTime().equals(cal2.getTime())); // false
System.out.println(cal1.getTime().after(cal3.getTime())); // false
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