It sounds like you need to change from US date format to an international date format, is that right?
You can do this easily by enabling "Culture support" in your botflow. You should find that in the Botflow settings. Once you have that enabled, you can use the Formula "ConvertDateCulture" to change from the US formatted date into the UK format. This should be enough to change from dd/mm/yyyy to mm/dd/yyyy.