Hi,
Check this....
UPDATE Table_Name SET quarter_startdate=CAST(YEAR(GETDATE()) AS VARCHAR(4))+'-'+
RIGHT('00'+CAST(MONTH(quarter_startdate) AS VARCHAR(2)),2)+'-'+
RIGHT('00'+CAST(DAY(quarter_startdate) AS VARCHAR(2)),2)
UPDATE Table_Name SET quarter_startdate= DATEADD(YEAR,YEAR(GETDATE())-YEAR(@quarter_startdate),quarter_startdate)
Regards,
GVPrabu