Weekly start each year on 1/1

Do you want to create your week based weekday of the first Jan?

if all weeks should start as on day 1st Jan

Week Start year based = DATEADD('Compare Date'[Compare Date],-1*WEEKDAY('Compare Date'[Compare Date])+weekday(STARTOFYEAR('Compare Date'[Compare Date])),DAY)

if the first week should start on 1st Jan

Week Start Year wise = if(STARTOFYEAR('Compare Date'[Compare Date])>'Compare Date'[Week Start date],STARTOFYEAR('Compare Date'[Compare Date]),'Compare Date'[Week Start date])

All above formula's column not measures

Appreciate your Kudos. In case, this is the solution you are looking for, mark it as the Solution. In case it does not help, please provide additional information and mark me with @
Thanks.

My Recent Blog - https://community.powerbi.com/t5/Community-Blog/Comparing-Data-Across-Date-Ranges/ba-p/823601