Hello Rod,
I am thinking that you are talking about the configuration of Web Interface report where default column name is "creation date".
If this is the scenario then-
This will be done on Web Interface.
That is while you have to use Web Interface report in the Web interface(use report widget and select Web-Interface report) and after selecting the WI report you will find a field "Date Format" in the report properties tab. Then use your required format to display in the WI.
Is that your requirement?
Please feel free to ask.