LINQ using a function inside a Where clause?

I am trying to do this:

myIEnumberable = myIEnumberable 
                .Where(myFunc(moveInDate, r => r.GetPropertyAsDateTime("date")) == true);

But getting the er开发者_如何学Goror:"cannot convert lamda expression to System.Date.Datetime because it is not a delegate type.

How do I go about writing this?

Thanks!

myIEnumberable = myIEnumberable
    .Where(r => myFunc(moveInDate, r.GetPropertyAsDateTime("date")) );