I need to plot oil production for each well on the attached spreadsheeet versus time in Excel. The problem is that I need these curves to start from a commun time zero. I cannot have them start at different times. Each one of these wells has a very different and random dates. My current process is to label each date as day 1 of production, day2, day 3 and then create a pivit chart but this is taking me a long time. Can you please help.