Obviously the best way would be to use a date format for the field in the database. This way you could focus on formatting the date properly without any need to do conversions.
However, if the format in the database is currently
DDMMYY
you could perhaps use something like the following to convert the data to a date
CDate(Left({Fields!DCDATE.Value},2) + "/" + Mid({Fields!DCDATE.Value},3,2) + "/" + "20" + Right({Fields!DCDATE.Value},2))
Remember to verify that the expressions correctly interprets days and months for example for first of February.
The to format the date you can try
ToText(previous formula, "MMM dd yyyy")