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HigHurtenflurst said:

Normally I should think a week will be included in the year it has the most days in it, thus that last week will actually be counted in 2014.

For the purposes of this kind of thing though adding on half of the sales for the week ending 4th Jan seems reasonable... in "real-time" then it's actually just under 7 weeks (15th to 31st is 46 days) but using VGC data from 7 + 1/2 a week

Most of the sales that week will be during december. Stores are closed on the 1st and 29. 30,31 are much bigger buying days.