java时间加半小时 java 时间加一分钟

  public static void main(String[] args) {

        String a=addtime("2018-2-8 16:17","110");
        System.out.println(a);

    }

Calendar 实现时间+ 分钟

    public static String addtime(String timeStr,String addnumber){
        String str=null;
        try {
            DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm");
            Date date = df.parse(timeStr);
            //时间累计
            Calendar gc =new GregorianCalendar();
            gc.setTime(date);
            gc.add(GregorianCalendar.MINUTE,Integer.parseInt(addnumber));
            str=  df.format(gc.getTime());
        }catch (Exception e){

        }

        return str;
    }