It would be great to be able to set the date that GW uses for the start of the month. Most peoples billing cycle for their ISP does not correspond with the first of the month, and so the statistics for monthly usage are not easily used.
My billing cycle starts on the tenth of the month, which means I am 10 days short on a previous month, and 10 days extra on the current month for total throughput.
Please go to the “Usage” tab them choose “Options” under where it says “Traffic”. Next choose “Usage Alerts” then you can set the traffic to any start day you prefer.