never mind. solved it myself
equivalent ssis expression
RIGHT("0" + (DT_WSTR, 2) DATEPART("DD", DATEADD("day", -3, GETDATE())),2)+" "+(DT_STR,50,1252)TRIM(SUBSTRING("January Febuary March April May June July August September October November December ",((DATEPART("MONTH",GETDATE())-1)*10)+1,10))+" " +RIGHT("0" + (DT_STR,4,1252)DATEPART( "yyyy" , getdate() ), 4)