DECLARE @Tuan INT
, @Nam char(4);
SELECT @Tuan = 38
, @Nam = 2014
-- once you have the @WeekNum and @YearNum set, the following calculates the date range.
SELECT DATEADD(wk, DATEDIFF(wk, 6, '1/1/' + @Nam ) + (@Tuan -1), 6) AS StartOfWeek;
SELECT DATEADD(wk, DATEDIFF(wk, 5, '1/1/' + @Nam ) + (@Tuan -1), 5) AS EndOfWeek;
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