用Java程序将日期转换为序列号，就像在Excel中一样 [英] Program in Java to convert a date to serial number as done in Excel

问题描述

我已经编写了一个函数，但没有给出实际的O / P ...

I have written a function but it does not give an actual O/P...

public int date(Object O) {
    if (O instanceof Date) {
        Date d1 = (Date) O;
        Calendar cal = Calendar.getInstance();
        cal.setTime(d1);
        int dd, mm, yy;
        dd = cal.get(Calendar.DAY_OF_MONTH);
        mm = cal.get(Calendar.MONTH);
        yy = cal.get(Calendar.YEAR);

        if (dd == 29 && mm == 02 && yy == 1900)
            return 60;

        long nSerialDate = ((1461 * (yy + 4800 + ((mm - 14) / 12))) / 4)
                + ((367 * (mm - 2 - 12 * ((mm - 14) / 12))) / 12)
                - ((3 * (((yy + 4900 + ((mm - 14) / 12)) / 100))) / 4) + dd
                - 2415019 - 32075;

        if (nSerialDate < 60) {
            // Because of the 29-02-1900 bug, any serial date
            // under 60 is one off... Compensate.
            nSerialDate--;
        }

        return (int) nSerialDate;
    }
    return -1;
}

主类

Main class

p s v main(String args[]){
CommonFunctionsImpl cmp= new CommonFunctionsImpl();
    Date date1 = null;
      try {
        date1 = new SimpleDateFormat("MM/dd/yy").parse("05/18/2008");

    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


    System.out.println("date-----"+cmp.date(date1));
}

输出 date- ---- 39556

在Excel中 DATE（2008,5,18） = 39586.00

我的程序O / P实际上与Excel O / P不匹配。

My program O/P doesn't actually match with Excel O/P.

推荐答案

正确的算法已在Apache POI中实现。
看一下类 org.apache。 poi.ss.usermodel.DateUtil 。

The right algorithm is already implemented in Apache POI. Take a look at class org.apache.poi.ss.usermodel.DateUtil.

此描述也可能有用： http://support.microsoft.com/kb/214094/en-us

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