java date减去小时-两个小时之间的时间

Question

我找不到我弄错的地方，它在同一日期工作得很好，但是当我输入不同的日期时，它就进行了巨大的计算。 它是我想做的停车场软件。 计算两个小时之间的时间

public void obtenerSalida(String fech, String fech_s,String hora_sal,String serie,String hora_e,
        javax.swing.JTextField periodo){

    String per;

    String dateStart =fech+" "+hora_e;
    String dateStop =fech_s+" "+hora_sal;

    System.out.println(dateStart);
    System.out.println(dateStop);


    SimpleDateFormat format = new SimpleDateFormat("yy/MM/dd 00:00:00");  

    Date d1 = null;
    Date d2 = null;
    try {
        d1 = format.parse(dateStart);
        d2 = format.parse(dateStop);
    } catch (ParseException e) {
        e.printStackTrace();
    }
    long diff = d2.getTime() - d1.getTime();
    long diffSeconds = diff / 1000%60;         
    long diffMinutes = diff / (60 * 1000);         
    long diffHours = diff / (60 * 60 * 1000); 

    if((diffMinutes>=1) && (diffMinutes<60)){
        periodo.setText(diffMinutes + " minuto(s).");
    }
    else
        if((diffMinutes>=60)&&(diffHours>=1 && diffHours<10)){
           per=diffHours+":"+(diffMinutes%60);
           periodo.setText(per);
        }

    System.out.println("Time in seconds: " + diffSeconds + " seconds.");         
    System.out.println("Time in minutes: " + diffMinutes + " minutes.");         
    System.out.println("Time in hours: " + diffHours + " hours.");
    System.out.println(""+diff);
}

例

I enter this values
fech = 6/12/2016
fech_s = 7/12/2016
hora_e = 1:41:49
hora_s = 8:18:43

我知道了

6/12/2016 1:41:49
7/12/2016 8:18:43
Time in seconds: 54 seconds.
Time in minutes: 525996 minutes.
Time in hours: 8766 hours.

我知道那是完全错误的。 不可能那么久

Answer 1

查看您的日期和日期格式：

SimpleDateFormat("yy/MM/dd 00:00:00")

但您以其他格式输入日期。 而是使用格式：

"d/MM/yyyy HH:mm:ss"