incremental load with integer (yyyymmdd) in dataflow

Hi, I am new to power bi and so please excuse me if it is a silly question. I am looking for  a way to implement incremental load with  integer in a dataflow. I have found steps to do it in the desktop and then publish it to service but no direct way to do in dataflow. I created the range start & end in the data flow and the invoked function to convert integer (yyyymmdd) to date but when i try to configure the incremental in dataflow , its popping no data/time column.

Thanks