Attempting to accomplish the goals of counting only dates between the last collection to the date displayed in Sheet3!A1 also to apply red font to the cell if the last collection was three or more weeks ago (although as Richard said "To colour the number different to the rest of the text would need a macro").
This proposed solution uses two helper columns on sheet 2 columns XFC3:XFD3 and down which are populated by the formulas (respectively): There is also a formula in Sheet2!XFC2 as follows: The formula that populates sheet3 column B, except for where a name is already entered is: The formula that serves a conditional formatting rule for those cells is: In sheet 2 rows 3:19 I put in all of the collection possibilities and the results seem to work, since you said to display numeric values of three or greater only.
Let us know if you have any questions.
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