I have a default value that is populating a read only text field, that
contains the date from the date picker as part of the value. It goes
like this:

manufacture date: (user selected)
product: 6 digits (user entered)

I have a barcode field that gets auto-populated from those two values
like this:

01012000999999

By concatinating the two user selected fields. My problem is that the
date doesn't show because the / / / aren't trimmed in the function.

Is there a way to trim out slashes and time from a date picker to
populate a text box using an expression?