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Farsala on 22 February 2018
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RolStoppable said:
Farsala said:

It seems it includes Dec 31 as well.

It's actually pretty interesting that some January's don't include New Years day. For example a very poor January (2016) is Jan 3-31. No surprise that the December 2015 was one of the strongest...

I wasn't sure if NPD weeks start on Sundays or Mondays. December 31st was a Sunday.

The logic of the retail calendar set by the National Retail Federation is that if a four-week-January leaves out 4+ days at the end of January, it needs to be turned into a five-week-January; since your post reinforced that NPD weeks start on Sundays, in 2018 January 28-31 would have been left out in a four-week-January, so that's why the month became a five week period. This system creates the occasional oddity in tracking periods over the years.

Yep and sadly that means comparing Jan to Jan YoY is quite variable with the different tracking periods especially smashed between the strongest month and the strongest non holiday month.