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sofiabasFlag for United States of America

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Plotting Time series with Different dates

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.
Thank you
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Thanks, sofiabas.