Describes the cause and action for error messages.
Error Message(English)：
does not adding 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
Excel not showing time correctly
https://superuser.com/questions/681804/excel-not-showing-time-correctly
worksheet function - Excel isn't calculating the ...
https://superuser.com/questions/309181/excel-isnt-calculating-the-sum-of-cells
Entering Time data in excel in mm:ss format ...
https://superuser.com/questions/235555/entering-time-data-in-excel-in-mmss-format-without-the-leadin・・・
How to get Average for time in Excel 2007?
https://superuser.com/questions/102699/how-to-get-average-for-time-in-excel-2007
Add or subtract time - Excel - Office Support - Office 365
https://support.office.com/en-us/article/add-or-subtract-time-16aa6697-6d6e-49c1-8e2c-3398a7cad6ad
Sum up hours and minutes in Excel by Chris Menard - YouTube
https://www.youtube.com/watch?v=7sZUwBod-Uw
https://www.youtube.com/watch?v=7sZUwBod-Uw
How to Use an Excel Formula to Sum Time Values
http://www.consultdmw.com/excel-summing-time.html