java中关于日期 Date 的相关操作

1.   /**
2.   * 计算日期差值。
3.   * 
4.   * @param sBeginDate
5.   * @param sEndDate
6.   * @return
7.   */
8.   public int computeCoolingOffPeriod(Date sBeginDate,Date sEndDate) throws Exception{
9.          Calendar calendar1=Calendar.getInstance();;
10.          Calendar calendar2=Calendar.getInstance();;
11.         
12.          calendar1.setTime(sBeginDate);
13.          calendar2.setTime(sEndDate);
15.          return  (int)( (calendar2.getTimeInMillis()-calendar1.getTimeInMillis())/1000/60/60/24 );//获取天数的差值。
17.          
18.  }

1  ，计算一日期加上若干天之后的日期。

/** *//**
     * 期日を増加します
     * 
     * @param date String対象
     * @param inteval int対象
     
     * @return String対象
     */
    public static String resetDay(String date,int inteval) ...{
        String dateTimeFrom = "";
        try ...{
            // DateFormat df = DateFormat.getDateTimeInstance();
            Calendar calendar = new GregorianCalendar();
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy/MM/dd");
            calendar.clear();
            calendar.set(Integer.parseInt(date.substring(0,4)), Integer.parseInt(date.substring(5,7)) - 1, Integer
                    .parseInt(date.substring(8, 10)));
            
            calendar.add(Calendar.DAY_OF_MONTH, inteval);
            
            dateTimeFrom = simpleDateFormat.format(calendar.getTime());
            return dateTimeFrom;
        } catch (Exception e) ...{
            e.getMessage();
            return "";
        }

    }

 

2 ，计算两个日期相差几天。

 

/** *//**
     * ２つの任意の期日間の違いの運命を計算します（自然の日）
     * 
     * @param sBeginDate String対象
     * @param sEndDate String対象
     * 
     * @return 期日間の違い
     * @throws Exception 例外を発生した場合の対象。
     */
      public int computeCoolingOffPeriod(String sBeginDate,String sEndDate) throws Exception...{
        Calendar calendar1=Calendar.getInstance();;
        Calendar calendar2=Calendar.getInstance();;
        SimpleDateFormat formatter1 = new SimpleDateFormat("yyyyMMdd");//格式很重要：是20051031       //if (sBeginDate.equals("0")) {System.out.println("sBirthDate.equals====0");   sBeginDate = "19000101";     }

        calendar1.setTime(formatter1.parse(sBeginDate.replaceAll("/", "")));
        calendar2.setTime(formatter1.parse(sEndDate.replaceAll("/", "")));

        return  (int)( (calendar2.getTimeInMillis()-calendar1.getTimeInMillis())/1000/60/60/24 );//获取天数的差值。

        
      }

 

 

 

 

3  求一个日期在两个日期之间。

/** *//**
     * 有効な期限内の勤務区分を得ます

     * 
     * @param tmpArrayList ArrayList対象
     * @param fromDateString String対象
     * 
     * @return なし
     * @throws Exception 例外を発生した場合の対象。

     * 
     */
    private ArrayList resetList(ArrayList tmpArrayList,String fromDateString)throws Exception...{
        ArrayList applicationList = new ArrayList();
        for(int i = 0; i < tmpArrayList.size(); i++)...{
            
            SmallDateChoose smallDateChoose = (SmallDateChoose) tmpArrayList.get(i);
            Calendar fromDate = Calendar.getInstance();
            Calendar availabilityStartDate = Calendar.getInstance();
            Calendar availabilityEndDate = Calendar.getInstance();
            String availabilityStartDateString = smallDateChoose.getAvailabilityStartDate();
            String availabilityEndDatetring = smallDateChoose.getAvailabilityEndDate();
            fromDate.setTime(fromDate.getTime());
            fromDate.set(Integer.parseInt(fromDateString.substring(0, 4)), Integer
                    .parseInt(fromDateString.substring(5, 7)) - 1, Integer.parseInt(fromDateString
                    .substring(8, 10)));
            availabilityStartDate.set(Integer.parseInt(availabilityStartDateString.substring(0, 4)), Integer.parseInt(availabilityStartDateString
                    .substring(5, 7)) - 1, Integer.parseInt(availabilityStartDateString.substring(8, 10)));
            availabilityEndDate.set(Integer.parseInt(availabilityEndDatetring.substring(0, 4)), Integer.parseInt(availabilityEndDatetring
                    .substring(5, 7)) - 1, Integer.parseInt(availabilityEndDatetring.substring(8, 10)));

            if(! fromDate.before(availabilityStartDateString) & ! fromDate.after(availabilityEndDate))...{
                ArrayList tempList = new ArrayList();
                tempList.add(smallDateChoose.getWorkDivisionName());
                applicationList.add(tempList);
            }
        }
        
        return  applicationList;
    }

 4.根据日期获得对应的星期几。

 

/** *//**
     * 曜日を獲得します

     * 
     * @param argDate
     * 
     * @return なし

     * 
     */
    private String getDayOfWeek(String argDate) ...{

        if (argDate.length() != 10) ...{
            throw new IllegalArgumentException("argDate   length  !=   8");
        }
        int intArgY = Integer.parseInt(argDate.substring(0, 4));
        int intArgM = Integer.parseInt(argDate.substring(5, 7));
        int intArgD = Integer.parseInt(argDate.substring(8, 10));

        Calendar calendar = GregorianCalendar.getInstance();
        calendar.set(intArgY, intArgM - 1, intArgD);
        int returnDayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
        String showDate = "";
        switch (returnDayOfWeek) ...{
            case 1:
                showDate = "日";
                break;
            case 2:
                showDate = "月";
                break;
            case 3:
                showDate = "火";
                break;
            case 4:
                showDate = "水";
                break;
            case 5:
                showDate = "木";
                break;
            case 6:
                showDate = "金";
                break;
            default:
                showDate = "土";
                break;
        }
        return showDate;
    }

 

// 另一个Java获取各种常用时间方法

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