To improve the human readability of our cloud reporting we have added the week start date to the dimension itself. Previously we show weeks using the universal ISO Format W01 W02 W03 ... W21 W52. Now the format will be

w51 (Dec 20), W52 (Dec 27), W01 (Jan 03) ...

The data is reflective of the Monday that starts the week, consistent with the ISO standard week.