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SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     Date now = new Date();
     SimpleDateFormat ds = new SimpleDateFormat("yyyy-MM-dd ");
     Date startTime = df.parse(ds.format(now) +"18:00:00");

startTime = 2018-01-19 18:00:00

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 Calendar c = Calendar.getInstance();  
         c.setTime(now);  
         c.add(Calendar.DAY_OF_MONTH, 1);
      Date endTime = df.parse(ds.format(c.getTime()) + "18:00:00");

endTime = 2018-01-20 18:00:00