Thanks. But I am bit confused. where should I put that SimpleDateFormat("dd/MM/yy").parse("01/01/01") expression, and fields calculation type and reset type value? when I go to chart data -> details, it opens up window to select field and few transformation condition (like, toString, valuOf etc). But I don't see any place to set calculation type, reset type and also where should I place "SimpleDateFormat("dd/MM/yy").parse("01/01/01")"?