I guess the data type in that table field is in text, as Conerlysduck said the data is imported from file.
If that's the case, it will be a bit complicate to convert the date formats. First from string to date, change date format, and convert it back to string. Here's a
concept of update query might help
- UPDATE [Table name]
-
SET [date field name] = CStr(Format(Format(CDate([date field name]), "20yyddmm"), "mmddyyyy"))
Not sure if it fully works this way, you need to try it out with something similar as well.