Date Parameters Reports API

Hello – I am hoping some one can help.

I can call the reports API. However, I am trying to use the Start and End Date parameters and the API seems to ignore them. I have used the example in the documentation: Help Portal (

To ensure security this is an altered version of the URL:

Can anyone tell me why this is? I am wanting to use date parameters as there seems to be a 50,000 record limit.