// Calendar.HOUR_OF_DAY     24小時制
   // Calendar.HOUR     12小時制
    
    //獲取當天0點時間
    public static String getDate1(){
         Calendar cal = Calendar.getInstance();
         cal.set(Calendar.HOUR_OF_DAY, 0);//控制時
         cal.set(Calendar.MINUTE, 0);//控制分
         cal.set(Calendar.SECOND, 0);//控制秒
         SimpleDateFormat sdf = new
 
 SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }
    
    //獲取當天12點時間
    public static String getDate2(){
         Calendar cal = Calendar.getInstance();
         cal.set(Calendar.HOUR_OF_DAY, 12);
         cal.set(Calendar.MINUTE, 0);
         cal.set(Calendar.SECOND, 0
 
);
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }    
    
    //獲取本週一0點時間
    public static String getDate3(){
         Calendar cal = Calendar.getInstance();
         cal.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONDAY), cal.get
 
(Calendar.DAY_OF_MONTH), 0, 0,0);
         cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }    
    
    //獲取本月第一天0點時間
    public static String getDate4(){
         Calendar cal = Calendar.getInstance();
         cal.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,0);
         cal.set(Calendar.DAY_OF_MONTH,cal.getActualMinimum(Calendar.DAY_OF_MONTH));
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }
    
         //獲得本月最後一天24點時間
    public static String getDate5(){
         Calendar cal = Calendar.getInstance();
         cal.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,0);
         cal.set(Calendar.DAY_OF_MONTH,cal.getActualMaximum(Calendar.DAY_OF_MONTH));
         cal.set(Calendar.HOUR_OF_DAY, 24);
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }