Global Hardware 1 December 2018

[StarDoor]

Can a sales admin please explain how the HW YoY tool determines which weeks go to which months? In 2018 it decided that August and November are 5-week months, while September is only 4 weeks. I thought that the industry standard was for the months to be in a 4-4-5 pattern, with March, June, September, and December always being 5 weeks.

http://www.vgchartz.com/tools/hw_yoy.php?reg=Global&start_year=2017&end_year=2018&console=NS

Furthermore, does this mean that December 2018 will only be 4 weeks long, or will the year itself be 53 weeks?