@Test
public void toLabel_day_nextmonth() throws ParseException {

	Date start =  new SimpleDateFormat("yyyy/MM/dd z HH:mm:ss").parse("2011/05/31 EST 05:00:00");
	Date expect =  new SimpleDateFormat("yyyy/MM/dd z HH:mm:ss").parse("2011/06/01 EST 05:00:00");
	assertEquals(expect, DateUtils.addTime(start, Calendar.DAY_OF_MONTH, 1));
}