static void init(){
        SimpleDateFormat sdf =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
        sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
        try {
            startDay= sdf.parse("1900-01-01 00:00:00.000");
            endDay= sdf.parse("2001-12-04 00:00:00.000");

        } catch (ParseException e) {
            e.printStackTrace();
        }
    }