Can you query a SQL database if you don't have the sa username and password?
I have one way, but you will have to figure out the script or way to sort it. If you go to admin and export patient demographics, it will be saved as an Excel file. It says .csv, but it is formatted as Excel. You should find the "Date Added" in the AS column. Unfortuanately, at least for the Excel newbie, I couldn't find a way to sort it by date. But, if you can, you would then be able to do what your boss is looking for. HTH.