Excel unable to change date format

Describes the cause and action for error messages.

Error Message(English)：
unable to change date format

Resolution

https://www.youtube.com/watch?v=ngAE0dME9RA

Solved - Excel Dates Won't Change Format - YouTube
https://www.youtube.com/watch?v=gcx7lQam0ac

https://www.youtube.com/watch?v=gcx7lQam0ac

Unable to change date format in Excel [Solved] - Ccm.net
https://ccm.net/forum/affich-172180-unable-to-change-date-format-in-excel

Changing format of date in Excel
https://ccm.net/forum/affich-28689-changing-format-of-date-in-excel

Unable to Convert Date in Excel
https://ccm.net/forum/affich-841430-unable-to-convert-date-in-excel

I want to change date format in Excel
https://ccm.net/forum/affich-362318-i-want-to-change-date-format-in-excel

Cannot change the date format in Excel 2007
https://ccm.net/forum/affich-350882-cannot-change-the-date-format-in-excel-2007

How To Change the Date Format in Excel - Ccm.net
https://ccm.net/faq/28938-change-date-format-in-excel