How to show date difference in record type based on condition

Hi,

I want to display the difference between today's date and created date in record type as an integer value. Further, I want to show the value in certain colors based on condition (like if the values is less than 3 then green color; if the values are in between 3 and 5 then yellow; and if the values are greater than 5 then red). This values will only come when the status is not completed.

Can somebody guide me?.

Many thank,

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