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Level 10

FormCalc is good way to do it, I almost forgot about it. Although, don't assume months are specific number of days... as of February is not a full month and for the rest there's 7 months with 31 days and 4 months with 30 days... counting months in days may result in errors. It all depends how it should be calculated.

Also, I've sent you a message directly to you because for some reason the forum would not let me insert any new answer.