这没关系，我两天后想通了这一点！在报告属性中的语言设置为EN-GB它停止抱怨的日期格式，虽然我还是不明白为什么它摆在首位检查他们。因为我太新，我不能收我自己的问题。

It's ok, I figured this out after two days! By setting the Language in the Report's properties to 'en-GB' it stopped complaining about the format of the dates, although I still don't understand why it was checking them in the first place. I can't close my own question because I'm too new.