Being based in the UK we do not use the american date format but rather than re hard code this into our version I have adjusted it so that it can be altered through the resx.

To do this I Altered line 150 and 188 of WikiControlBase.vb replacing:
"MM/dd/yyyy HH:mm:ss"
with:
Localization.GetString("DateFormat", MyModule.LocalResourceFile)

Then I added to Router.resx the key
DateFormat
with value  (this is because of local, adjust this to any date stamp string you like)
"dd/MM/yyyy HH:mm:ss"

EDIT:
Also within TopicHistory.vb on Line 53  the same change is required.

I had tried this and it did chenge the locale for the date in all the other sections of the site however it did not seem to work it may have been due to the fact the the ldate locale was hard coded. 

EDIT: I can confirm that the localisation doesn't work by simply disabling the en-US local at least in this section of the wiki module. It may be a throw back to ktomics days. If the hard coded format was removed altogether what affect would that have as I know that localisation works on other areas of the site.

This hack is simply somthing that has worked for my deployments I'd love to hear how to properly implement the module localisation within dotnetnuke.