i need to limit a customers by 128kbps during day and 1024 at night… i tried by time but it happends that at day it works well but at night they willl get more than 1024kbps and also that specific quees wont report how much bandwidth is using… just displays 0kbps
yes,
maybe this link will help you about it methode... 
here: Add hotspot user for time 20:00:00PM-08:00:00AM