public static String getLastDayOfMonth(int year, int month) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month-1);
cal.set(Calendar.DAY_OF_MONTH,cal.getActualMaximum(Calendar.DATE));
return new SimpleDateFormat( "yyyy-MM-dd ").format(cal.getTime());
}
public static String getFirstDayOfMonth(int year, int month) {
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, year);
cal.set(Calendar.MONTH, month-1);
cal.set(Calendar.DAY_OF_MONTH,cal.getMinimum(Calendar.DATE));
return new SimpleDateFormat( "yyyy-MM-dd ").format(cal.getTime());
}
//需要注意的是:月份是從0開始的,比如說如果輸入5的話,實際上顯示的是4月份的最後一天,所以月份減去1了