Describes the cause and action for error messages.
Error Message(English)：
not summing time correctly
Adding of time in Excel gives a strange answer - Super User
https://superuser.com/questions/816640/adding-of-time-in-excel-gives-a-strange-answer
Sum returning 0 in Excel
https://superuser.com/questions/1106852/sum-returning-0-in-excel
worksheet function - Excel isn't calculating the ...
https://superuser.com/questions/309181/excel-isnt-calculating-the-sum-of-cells
How to get Average for time in Excel 2007?
https://superuser.com/questions/102699/how-to-get-average-for-time-in-excel-2007
How to Use an Excel Formula to Sum Time Values
http://www.consultdmw.com/excel-summing-time.html
Adding Up Times in Excel Results in Zero - The Excel Trainer
https://theexceltrainer.co.uk/adding-up-times-in-excel-results-in-zero/
Add or subtract time - Excel - Microsoft Office Support - Office 365
https://support.office.com/en-us/article/add-or-subtract-time-16aa6697-6d6e-49c1-8e2c-3398a7cad6ad
Excel Tips From John Walkenbach: Summing Times That Exceed 24 ...
http://spreadsheetpage.com/index.php/tip/summing_times_that_exceed_24_hours/
Sum up hours and minutes in Excel by Chris Menard - YouTube
https://www.youtube.com/watch?v=7sZUwBod-Uw