Hi duntr03,
I think you have question about expression of Power Filter.
The expression is divided into two parts, left and right, and separated by an operator like as below sample.
In this case, I selected values for Object, Field,Operator by using drop down list.
There is no syntax error.
If you edit Expression by manually, I recommend to use "Evaluate" button to check your Expression.
For example, If I modified Expression as below(wrong syntax), Evaluate will show "Invalid".
sugsh02_object01.date01 >> date("2018-06-11T00:00:00")
Regards,
Shoichi