当前日期与Android中输入日期之间的差异

Question

在这里，我发现了输入日期和当前日期之间的差异。 我的意思是我试图找到两个日期之间的天数。 如果两个日期都在同一个月，那么如果两个日期都在不同月份，则我得到正确的值，则差值不正确。 我没有得到如何纠正这一问题。

谁能帮助我得到这个？

这是我的代码：

public class MyService extends Service {

  String dayDifference;

  NotificationManager manager;
  Notification myNotication;

  @Override public IBinder onBind(Intent intent) {
    return null;
  }//End of onBind method

  public void onStart(Intent intent, int startId) {
    super.onStart(intent, startId);
    manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    try {

      //Dates to compare
      String CurrentDate;
      String FinalDate = "08/24/2016";

      Date date1 = new Date();
      Date date2;

      SimpleDateFormat dates = new SimpleDateFormat("mm/dd/yyyy");

      //Setting dates
      date1.setTime(System.currentTimeMillis());
      CurrentDate = dates.format(date1);
      date2 = dates.parse(FinalDate);
      date1 = dates.parse(CurrentDate);

      //Comparing dates
      long difference = Math.abs(date1.getTime() - date2.getTime());
      long differenceDates = difference / (24 * 60 * 60 * 1000);

      //Convert long to String
      dayDifference = Long.toString(differenceDates);

      Log.e("HERE.................", "HERE: " + dayDifference);
      System.out.println("..............difference date " + dayDifference);

      Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
      Intent targetIntent = new Intent(this, Mnst.class);

      PendingIntent pendingIntent = PendingIntent.getActivity(this, 1, targetIntent, 0);
      NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

      builder.setAutoCancel(true);
      builder.setTicker("Predictor");
      builder.setContentTitle("Miisky Notification");

      builder.setContentText(
          "You have " + dayDifference + " days left. Click on notification to know more..");
      builder.setSmallIcon(R.drawable.miilogo);
      builder.setSound(soundUri);
      builder.setContentIntent(pendingIntent);
      builder.setOngoing(true);
      //builder.setSubText("Your vault number is " + s.vault_no);   //API level 16
      builder.setNumber(100);

      builder.build();

      //noinspection deprecation
      myNotication = builder.getNotification();
      builder.setAutoCancel(true);
      manager.notify(11, myNotication);

      Toast.makeText(getApplicationContext(), " " + dayDifference + " Days Left ",
          Toast.LENGTH_LONG).show();
    } catch (Exception exception) {
      Log.e("DIDN'T WORK............", "exception " + exception);
    }
  }
}

此处输入的日期为“ 08/24/2016”，当前日期为“ 09/28/2016”。 我得到4作为不正确的结果。 我想我必须使用Calendar或其他方法。但是没有确切的方法来执行该操作。

Answer 1

根据文档 ，字母m被理解为分钟。 为了引用月份，您需要使用大写M

尝试将您的SimpleDateFormat更改为此：

SimpleDateFormat dates = new SimpleDateFormat("MM/dd/yyyy");

Answer 2

不要使用日期来执行此操作。尝试使用这样的日历。

public static final int diffOfDay(Date d1,Date d2){
    Calendar c1 = Calendar.getInstance();
    c1.setTime(d1);

    Calendar c2 = Calendar.getInstance();
    c2.setTime(d2);

    return c1.get(Calendar.DAY_OF_MONTH) - c2.get(Calendar.DAY_OF_MONTH);
}

Answer 3

我遇到过同样的问题。

更改

return c1.get(Calendar.DAY_OF_MONTH) - c2.get(Calendar.DAY_OF_MONTH);

得到不同月份的日期差异

return c1.get(Calendar.DAY_OF_YEAR) - c2.get(Calendar.DAY_OF_YEAR);