I know this may seem trivial and I'm sure it is, but I'm playing a video game and I'm trying to track the price for materials on the server's trading post. I want to find the best day(s) and time(s) to sell (mostly) and buy (maybe) certain materials. I already have a sheet that I enter the Material Name, Cost, Date and Time. What I need is a way to visually represent that information. Any ideas using Excel?