I am using an Arduino to send data from my solar hot water system to pachube. So far it has worked well, but I would like to reset a data stream on a daily basis at midnight each day. I have a flow sensor that sends a pulse each time a gallon of water has flowed. So far it just accumulates unit the Arduino is reset. I am looking for a way to do this without having the Arduino have to keep track of network time to keep it simple. Are there any easy ways to do this?