I tried the loaded_startdate and loaded_enddate stuff that you sent from the API docs. However, I'm not able to get them to work in our demo environment using the api testing tool.

In case you do not want to load a bunch of data; using 'loaded_startdate' and 'loaded_enddate' you can get only records changed between that duration. This will improve your app performance.

It should give you the changes that have occurred in the window of time between loaded_startdate and loaded_enddate