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If we want to get technical about the wording, it should say "Select Starting Week (Inclusive)" and then "Select Ending Week (Exclusive)", meaning if you selected 30st Dec 2007 to 30st Dec 2007 it would give you 7 days of sales (or more likely an error), and if you select 30st Dec 2007 and 6th Jan 2008, you'd get the same 7 days.