set DATEFIRST 1

SELECT *, Year(DateDecl) As Год, Month(DateDecl) As Месяц

, DatePart(wk, DateDecl) AS Неделя

, DatePart(weekday, DateDecl) AS День_недели

FROM [TEST].[dbo].[IncGret]

WHERE DateDecl BETWEEN '2017-01-01' AND '2018-11-11'