ERW uses the setup according the Windows setup. If the date format is reading incorrectly, then first check the settings in the Control Panel of your computer. Go to Region and Language, then the Formats tab.
Check what setting is selected in the Short and Long date fields, depending on the date format required in your report/s.
If this is showing the correct format, then it is likely that the field in the report has been set as a specific date format.
Open the report and go to the field. Right click on the field and choose Display Format. Then select the required format.
If the issue is with a date in the parameter selection, then this is driven from the Windows settings only.