duh !!
MY MISTAKE - it not a calulated field thet date is an offsit depending on the type of record. it was my state that was wrong here the correction and it works. granted hard coding a date is bad form, but I needed to test the correction out
declare @Newdate datetime
SET @Newdate = '6/16/2007'
UPDATE [TRACKIT7_DATA2].[dbo].[TASKS]
SET [DUEDATE] ='6/16/2007'
FROM [TRACKIT7_DATA2].[dbo].[TASKS]
where RESPONS = person one' and STATUS = 'Overdue'