Issue getting date/time format for incremental refresh set up

Hi all, I have a singular dataset with source from starburst odbc. There are many millions of rows a month (20 million) and I would rather set up incremental refresh so it's just pulling in the latest data daily and I can have at least 4-5 months backlook in here. 

However, I have followed the steps from documentation and still have errors. https://learn.microsoft.com/en-us/power-bi/connect-data/incremental-refresh-configure#convert-datetime-to-integer

1. I tried to just make my date field a date/time field:

• The format changed, but still when I try to filter the field, it only recognises it as a date. And so I cannot use RangeStart and RangeEnd to filter it by. 
• 

2. I tried using the conversion steps to make my date an integer. But I get an error message when I try to add = Table.SelectRows(#"Reordered Column OrderDateKey", each [OrderDateKey] > DateKey(RangeStart) and [OrderDateKey] <= DateKey(RangeEnd)) to my query. Also how do I add this alongside the other information already in my query formula? 

I have tried searching everywhere and videos, but nowhere is giving me different advice. So I am kind of stumped what to try...