If you're only after this for a handful of fields, you can use widget="char" in the view definition of the field to force it to be just a regular text box. However, this means you will need to type in the system date format such as %Y-%m-%d %H:%M:%S, rather than the language based format you see in a regular date/datetime field. The date/datetime widget normally handles this abstraction for you.

To do it system wide, you would need to modify the date/datetime widgets to act like a char field, and optionally allow users to type in a date in their language format and convert it for them.