You can use sumifS to perform the summing up of row values, however when you're asking for them to be shown on Week and Month format you're going to need to be a bit clearer. How do you want this part to work?
You could use Excel WEEKNUM and or MONTH functions alongside SUMIF to create a table detailing what the sales figures are for each Week Number or Month. You'd have to factor in YEAR also and perform SUMIFS as the data is now 13 months old.
For the original question
If Date in Column A (i.e. A2 less than 4 weeks from now)
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