当前月份的开始和结束日期

你去了：

public Pair<Date, Date> getDateRange() {    Date begining, end;    {        Calendar calendar = getCalendarForNow();        calendar.set(Calendar.DAY_OF_MONTH,     calendar.getActualMinimum(Calendar.DAY_OF_MONTH));        setTimeToBeginningOfDay(calendar);        begining = calendar.getTime();    }    {        Calendar calendar = getCalendarForNow();        calendar.set(Calendar.DAY_OF_MONTH,     calendar.getActualMaximum(Calendar.DAY_OF_MONTH));        setTimeToEndofDay(calendar);        end = calendar.getTime();    }    return Pair.of(begining, end);}private static Calendar getCalendarForNow() {    Calendar calendar = GregorianCalendar.getInstance();    calendar.setTime(new Date());    return calendar;}private static void setTimeToBeginningOfDay(Calendar calendar) {    calendar.set(Calendar.HOUR_OF_DAY, 0);    calendar.set(Calendar.MINUTE, 0);    calendar.set(Calendar.SECOND, 0);    calendar.set(Calendar.MILLISECOND, 0);}private static void setTimeToEndofDay(Calendar calendar) {    calendar.set(Calendar.HOUR_OF_DAY, 23);    calendar.set(Calendar.MINUTE, 59);    calendar.set(Calendar.SECOND, 59);    calendar.set(Calendar.MILLISECOND, 999);}

PS：

Pair