Dynamics CRM 2011 Date Picker Displays US format

This post will only help if you are using the On Premise version - I don't have a solution for the Online version. BTW, I was using SQL Server 2008 R2.

If  you add date parameters to a report that you want to run in Dynamics CRM 2011 then you get prompted to enter the dates. If you set the parameters as type DateTime then a date picker is also displayed.

But when you select a date, the picker puts the date in as US format.  It will still filter the data correctly but I wanted UK format displayed. 

The clue came from this blog.  Now in fact when I ran my report in Report Server (i.e. outside CRM) the date format displays correctly.
So I finally found the solution. You need to add Culture="en-GB" to the reportviewer.aspx page located at C:\Program Files\Microsoft Dynamics CRM\CRMWeb\CRMReports\rsviewer.  Note its the rsviewer directory not the viewer directory. I added it to the end of the first line - the <%@ Page declaration.  

Then the date displayed in UK format in CRM.