java正确的时间格式

Question

我写了一个倒计时计时器，我为它设置了时间，当我显示时间时，它的设置时间+1，我怎么能更正它呢？这是我的代码

    SimpleDateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");   
    future=dateFormat.parse("2018-09-25 15:00:00");   
    Date now=new Date();

    if (!now.after(future)) {
        long diff = future.getTime() - now.getTime();
        long days = diff / (24 * 60 * 60 * 1000);
        diff -= days * (24 * 60 * 60 * 1000);
        long hours = diff / (60 * 60 * 1000);
        diff -= hours *( 60 * 60 * 1000);
    }

。。。。。。 例如，如果从1天13:00:00开始计数，则从14开始计数

Answer 1

希望这能帮你把时间转换成毫秒。。 你所要做的就是使用定时器。更新标签中剩余的时间。 下面是将dateTimet转换为毫秒的示例代码

String myDate = "2014/10/29 18:10:45";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Date date = sdf.parse(myDate);
long millis = date.getTime();


            CountDownTimer    countDownTimer = new CountDownTimer(millis , 1000) {
                        @Override
                        public void onTick(long millisUntilFinished) {

                            if (getActivity() != null && !getActivity().isFinishing()) {
                                expiryLabel.setText(getResources().getString(R.string.expiresIn,
                                        " " +formatTime(millisUntilFinished));
                            }
                        }

                        @Override
                        public void onFinish() {

                            if (getActivity() != null && !getActivity().isFinishing()) {

                            // do what ever you want
                            }
                        }
                    };
                    countDownTimer.start();

                }




 public static String formatTime(long millis) {
        String output = "00:00:00";
        long seconds = millis / 1000;
        long minutes = seconds / 60;
        long hours = minutes / 60;

        seconds = seconds % 60;
        minutes = minutes % 60;
        hours = hours % 60;

        String secondsD = String.valueOf(seconds);
        String minutesD = String.valueOf(minutes);
        String hoursD = String.valueOf(hours);

        if (seconds < 10)
            secondsD = "0" + seconds;
        if (minutes < 10)
            minutesD = "0" + minutes;
        if (hours < 10)
            hoursD = "0" + hours;

        output = hoursD + ":" + minutesD + ":" + secondsD;



        return output;
    }