Incorrect format of date parameters via datepicker - Reporting Services

Solution:

Add the Culture setting in the ReportViewer.aspx like below:


<%@ Page Language="C#" AutoEventWireup="true" Inherits="Microsoft.ReportingServices.WebServer.ReportViewerPage" Culture="en-AU"%>

Tip:
You can find the page here: C:\program files\microsoft SQL Server\MSQL.3\Reporting Services\ReportServer\Pages

If you want to find the path to the page go to your IIS under Default website select ReportServer or Reports Folder > right click Properties...