tsql - Get first day of week T-SQL

Question

How get first day of week (Monday) where week = 6 and year = 2020 I need get 10.02.2020

eg. week 1 in 2020 is date from 06.01.2020 - 12.01.2020 week 6 in 2020 is date from 10.02.2020 - 16.02.2020

Answer 1

DECLARE @YEAR int = 2020;
DECLARE @WEEKSTOADD int = 6;
SET DATEFIRST 1;

SELECT 
        DATEADD(day, 
                1 -  DATEPART(dw,DATEADD(week,@WEEKSTOADD,cast(cast(@YEAR as varchar(4)) + '0101' as date))), 
                DATEADD(week,@WEEKSTOADD,cast(cast(@YEAR as varchar(4)) + '0101' as date)))