Mr. Nagano at Ricoh Japan commented a request on JMP Japan’s Facebook.
When importing a column from some CSV files that has YYYYY/MM/DD format with “Import Multiple Files” menu, we are not able to read the column as date format like the following figure.

He points out he could read it as date format using [file] > [open] menu.
I agree with his request. There are cases when we want to combine multiple date files into one, and it would be useful to be able to read them directly in date format at that time.