Please upload a workbook or a representative cut down copy, anonymised if necessary. It is always easier to advise if we can see your request in its context.
Show a before and after situation with manually calculated results, explaining which information is data and which is results, and if it's not blindingly obvious how you have arrived at your results some explanatory notes as well.
If it really is text in the way you describe then you'll need a either a two column lookup table or the equivalent lookup in the formula to convert he text 'Jan' to a month number. Then a
However as with so many of these things this is a much simplified example and might not represent all your data. We often find that when we give an answer to what is a trivial non representative example when the solution is used with the real world data it doesn't work because of factors like string length and other stuff which is important but hasn't been mentioned.
Therefore upload your real workbook as mentioned
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