Hi Anne
We have updated HelpMaster to add a region selection drop down box to the web interface settings screen, this will allow setting the regional formats to any region. this will be available in the next maintenance release.

There is a workaround that you can use at the moment,
If you open your database and locate the table tblWebInterfaceSettings, there is a setting in this table named 'DefaultLanguage' find this item and change its value to en-US.

NOTE: this may require users that have already logged in to the web interface to reset their cookies. (In the next maintenance release this will not be required).
Only regional codes starting with an en at the start will work correctly using this fix e.g(en-US, en-NZ, en-AU, etc). (In the next maintenance release all regional codes will work)