This bug should win an award for the most obscure bug I've ever run into this
year.
Check out this code below:
Calendar cal1 = new GregorianCalendar(2012, 5, 11);
cal1.setTimeZone(TimeZone.getTimeZone("UTC"));
Calendar cal2 = new GregorianCalendar(2012, 5, 12);
cal2.setTimeZone(TimeZone.getTimeZone("UTC"));
DateFormat df = new SimpleDateFormat(