In the stuff i do for a report im just knocking up a last seven days like the e.g. below

Is the right way? and will it calculate properly?
Or do i need to make a one off last 7 days version and how?
In the stuff i do for a report im just knocking up a last seven days like the e.g. below

Is the right way? and will it calculate properly?
Or do i need to make a one off last 7 days version and how?
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