DateUtil { public static DateRange calendarToMonthRange(Calendar calendar) { DateTime date = new DateTime(calendar); return new DateRange(new Interval(date.withDayOfMonth(1), date.withDayOfMonth(getDaysInMonth(date)))); } private  DateUtil(); static int getWeekNumberForDate(Date date, int configuredFirstDayOfWeek); static void dayOfWeekFix(Calendar calendar); static boolean isWeekend(Calendar calendar); static int getDaysInMonth(Calendar calendar); static int getDaysInMonth(DateTime calendar); static DateRange calendarToMonthRange(Calendar calendar); static boolean isDateWithinRange(Date date, DateRange dateRange); static boolean isDateWithinRange(DateTime date, DateRange dateRange); static boolean isDateWithinRange(Calendar calendar, DateRange dateRange); static boolean isDateRangeOverlaps(DateRange rangeA, DateRange rangeB); static DateRange getDateRangeForWeek(Calendar calendar); static DateRange getDateRangeForMonth(Date date); static DateRange getDateRangeForMonth(Calendar calendar); static DateRange getDateRangeForQuarter(Calendar calendar); static Calendar addQuarter(Calendar calendar, int quarterDelta); static Date nullifyTime(Date date); static void nullifyTime(Calendar cal); static void maximizeTime(Calendar cal); static Date maximizeTime(Date date); static List<Date> createDateSequence(DateRange range, EhourConfig config); static Calendar getCalendar(EhourConfig config); static Calendar getCalendar(Date date); static String getPatternForDateLocale(Locale dateLocale); static String formatDate(Date date, Locale dateLocale); static String formatDate(DateTime date, Locale dateLocale); static String formatDate(LocalDate date, Locale dateLocale); static int fromCalendarToJodaTimeDayInWeek(int dayInWeek);  }
@Test public void testCalendarToMonthRange() { Calendar cal = new GregorianCalendar(2006, 11 - 1, 4); DateRange dr = DateUtil.calendarToMonthRange(cal); assertEquals(106, dr.getDateStart().getYear()); assertEquals(10, dr.getDateStart().getMonth()); assertEquals(1, dr.getDateStart().getDate()); assertEquals(106, dr.getDateStart().getYear()); assertEquals(10, dr.getDateEnd().getMonth()); assertEquals(30, dr.getDateEnd().getDate()); assertEquals(23, dr.getDateEnd().getHours()); assertEquals(0, dr.getDateStart().getHours()); assertEquals(4, cal.get(Calendar.DATE)); }