کار نکردن آلارم منیجر برای زمان های بزرگ

 private static void setAlarm(Context context, Calendar alarmDate, PendingIntent pIntent) {
 AlarmManager alarmManager = (AlarmManager) context .getSystemService(Context.ALARM_SERVICE);
 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { alarmManager.setExact(AlarmManager.RTC_WAKEUP, alarmDate.getTimeInMillis(), pIntent); 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, alarmDate.getTimeInMillis() - 15, pIntent); } 
} else { 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { 
alarmManager.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, alarmDate.getTimeInMillis(), pIntent); } 
alarmManager.set(AlarmManager.RTC_WAKEUP, alarmDate.getTimeInMillis(), pIntent); } }

این یک کلاس کامل برای آلارم هست امیدوارم مفید واقع بشه 

که میتونید نسبت به نیاز خودتون ویرایش کنید

public class AlarmManagerHelper extends BroadcastReceiver {

   public static final String ID = "id";
   public static final String TIME_HOUR = "timeHour";
   public static final String TIME_MINUTE = "timeMinute";
   public static final String TONE = "alarmTone";

@Override
public void onReceive(Context context, Intent intent) {
      setAlarms(context);
}

   public static void setAlarms(Context context) {
      cancelAlarms(context);

AlarmDBHelper dbHelper = new AlarmDBHelper(context);
List<AlarmModel> alarms = dbHelper.getAlarms();

Calendar nextAlarm = null;

      if (alarms != null) {
         for (AlarmModel alarm : alarms) {
            if (alarm.isEnabled) {
               PendingIntent pIntent = createPendingIntent(context, alarm);

Calendar alarmDate = Calendar.getInstance();
alarmDate.set(Calendar.HOUR_OF_DAY, alarm.timeHour);
alarmDate.set(Calendar.MINUTE, alarm.timeMinute);
alarmDate.set(Calendar.SECOND, 0);

// don't set alarms in the past
Calendar cur = Calendar.getInstance();
               while (cur.after(alarmDate)) {
                  alarmDate.add(Calendar.DATE, 1);
}

               // only set more than 24hr in the future if a specific day
               // of week is selected
               // otherwise, the next closest time should be used
if (alarm.repeatWeekly) {
                  while (!alarm.getRepeatingDay(alarmDate
                        .get(Calendar.DAY_OF_WEEK) - 1)) {
                     alarmDate.add(Calendar.DATE, 1);
}
               }

               if (nextAlarm == null || nextAlarm.after(alarmDate)) {
                  nextAlarm = (Calendar) alarmDate.clone();
}

               setAlarm(context, alarmDate, pIntent);
}
         }
      }

      if (nextAlarm != null) {
         SimpleDateFormat sdf = new SimpleDateFormat("M/d h:mm a", Locale.US);
sdf.setCalendar(nextAlarm);
Settings.System.putString(context.getContentResolver(),
Settings.System.NEXT_ALARM_FORMATTED,
sdf.format(nextAlarm.getTime()));
} else {
         Settings.System.putString(context.getContentResolver(),
Settings.System.NEXT_ALARM_FORMATTED, "");
}
   }

   private static void setAlarm(Context context, Calendar alarmDate,
PendingIntent pIntent) {
      AlarmManager alarmManager = (AlarmManager) context
            .getSystemService(Context.ALARM_SERVICE);
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
         alarmManager.setExact(AlarmManager.RTC_WAKEUP,
alarmDate.getTimeInMillis(), pIntent);
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,
alarmDate.getTimeInMillis() - 15, pIntent);
}
      } else {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            alarmManager.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP,
alarmDate.getTimeInMillis(), pIntent);
}
         alarmManager.set(AlarmManager.RTC_WAKEUP,
alarmDate.getTimeInMillis(), pIntent);
}
   }

   public static void cancelAlarms(Context context) {
      AlarmDBHelper dbHelper = new AlarmDBHelper(context);
List<AlarmModel> alarms = dbHelper.getAlarms();

      if (alarms != null) {
         for (AlarmModel alarm : alarms) {
            if (alarm.isEnabled) {
               PendingIntent pIntent = createPendingIntent(context, alarm);

AlarmManager alarmManager = (AlarmManager) context
                     .getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(pIntent);
}
         }
      }
   }

   private static PendingIntent createPendingIntent(Context context,
AlarmModel model) {
      Intent intent = new Intent(context, AlarmReceiverAlarm.class);
intent.putExtra(ID, model.id);
intent.putExtra(TIME_HOUR, model.timeHour);
intent.putExtra(TIME_MINUTE, model.timeMinute);
intent.putExtra(TONE, model.alarmTone);

      return PendingIntent.getBroadcast(context, (int) model.id, intent,
PendingIntent.FLAG_UPDATE_CURRENT);
}

}