Facing problem in converting tableau calculated fields to power BI DAX measures

I am converting the tbleau measures to Power DAX measures. Help in this is needed.

1) column1 = DATEADD('hour',-6,[column2])

2)column3=

IF DATEPART('weekday',DATEADD('month',10,DATETRUNC('year',[[column1]))) = 1

THEN DATEADD('day',0,DATEADD('hour',2,DATEADD('month',10,DATETRUNC('year',[column1]))))

ELSE DATEADD('day',8-DATEPART('weekday',DATEADD('month',10,DATETRUNC('year',[column1]))),
DATEADD('hour',2,DATEADD('month',10,DATETRUNC('year',[column1]))))

END

 this is urgent.

Please Help.

Thanks in advance