Date arguments are not working when downloading images over a rectangle

[t-boo]

I just tried downloading Sentinel 2 images with the following command:
python Sentinel_download.py --latmin 40.591 --latmax 60.095 --lonmin -19.245 --lonmax 34.146 -d 20160601 -f 20160901.
The script connects to the server, but doesn't start any downloads. When I remove the date arguments, the downloads start flawlessly.