Transforming Date types in SSIS from an Excel Source

Hi,
I am using SSIS to import data from multiple excel files  into a SQL Server database staging table using a ForEachLoop container control flow task.
The staging table has a column Date of data type NVARCHAR.

The imported date values are not consistently formatted (see below)Is there some way in SSIS that I can ensure that all date formats are uniform  so that they will be consistent in the Staging Table?
Ideally I would like them all to be in the format
30-Sep-2009

any guidance appreciated, thanks