So I'm looking to sum the YTD sales through the current date by each customer in my list. But I have a second column for last years sales also and I want to sum the YTD sales for last year through the current date from last year. For example, I want to sum my YTD sales by customer through 2/19/16 and then in the column next to it I want to show the YTD sales through 2/19/15 so I can compare where we were last year through this date vs. this year through the same date. What would be the easiest formula to use to calculate this for this year and last year through the same month & day?
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