buf = new StringBuilder();
f.printTo(buf, dt.getMillis());
assertEquals("Wed 2004-06-09T11:20:30+01:00", buf.toString());
buf = new StringBuilder();
ISODateTimeFormat.yearMonthDay().printTo(buf, dt.toLocalDate());
assertEquals("2004-06-09", buf.toString());
buf = new StringBuilder();
try {
ISODateTimeFormat.yearMonthDay().printTo(buf, (ReadablePartial) null);