DateTime date = new DateTime(2013, 10, 2, 12, 0);
TodayDateRangeHandler handler = new TodayDateRangeHandler();
DateTime dateStart = handler.retrieveDateStart(date);
Assert.assertEquals(2013, dateStart.getYear());
Assert.assertEquals(10, dateStart.getMonthOfYear());
Assert.assertEquals(2, dateStart.getDayOfMonth());
DateTime dateEnd = handler.retrieveDateEnd(date);