Forumla not picking up a Variable

Please can someone help with the below part of code, id like the user to choose what formula he will be using and then choosing a variable number inside that formula which is called DateRange, but when i F8 through the DateRange goes to the number i put but then when it puts in the formula the DateRange parts shows as 0, any ideas what would cause this.

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Dont worry, me being stupid, all working now.