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My day job is in the IT industry and I know just enough about Microsoft Excel to be dangerous. That being said I created a gardening spreadsheet to track all my plantings in a garden season. You enter your plant name, date planted, days to harvest, and the spreadsheet calculates when your harvest should be. It will also track the number of days between your first and last harvests if you enter those dates also. Enjoy.
Garden Yield Spreadsheet