I put my thoughts and research on this into a hub of the same topic some time ago. If you are after long term traffic which we all typically are then the day of the week or time of the day won't matter. It does help give an initial bump to views but then again depends on where you are, time zones etc. I'd be interested in your thought on the hub content then. ( can't link it here however )
You can help the HubPages community highlight top quality content by ranking this answer up or down.