✔ 最佳答案
問題出現在負數時間代表時間值早於 1900 年,在電腦系統上產生錯誤!參考下面網址。
http://j-walk.com/ss/excel/usertips/tip051.htm
http://excelribbon.tips.net/T006239_Displaying_Negative_Times.html
依網址修正為用 1904 時間系统之後。
用
C1=A1-B1
C5=SUM(C1:C3)
便正常了。
圖片參考:
https://s.yimg.com/rk/HA00388954/o/114228517.bmp
2014-02-21 12:53:00 補充:
辦工室按鈕(左上角)-->Excel選項-->進階-->卷軸向下拉到底。便會看見 [ 使用 1904 年日期系统 ]選項。
我的是 Excel 2007。
2014-02-22 00:50:55 補充:
To change the date system, follow these steps:
1. Display the Excel Options dialog box. (In Excel 2007 click the Office button and then click Excel Options. In Excel 2010 display the File tab of the ribbon and then click Options.)
2. Click Advanced at the left side of the dialog box.
2014-02-22 00:52:29 補充:
3. Scroll through the options until you see the section called When Calculating This Workbook.
4. The Use 1904 Date System check box controls which dating system is used, just as in earlier version of Excel.
睇 第 2 條 link 啦!