AlarmManager no funciona para una fecha específica

He estado tratando de configurar AlarmManager para una fecha específica, ¡pero no funciona en absoluto! Cuando solo uso el tiempo, funciona bien. Aquí está el código:

SharedPreferences prefs = PreferenceManager
                    .getDefaultSharedPreferences(this);
            String getEventTime = prefs.getString("EventSTime", "");
            String getEventDate = prefs.getString("EventDate", "");
            Toast.makeText(this, getEventTime + " " + getEventDate,
                    Toast.LENGTH_LONG).show();
            String temp = "", temp2 = "";
            DateFormat dateformat = new SimpleDateFormat("HH:mm");
            DateFormat dateformatDate = new SimpleDateFormat("dd-MM-yyyy");
            try {
                temp = dateformat.format(dateformat.parse(getEventTime));
                temp2 = dateformatDate.format(dateformatDate
                        .parse(getEventDate));
                Toast.makeText(this, temp + " " + temp2, Toast.LENGTH_LONG)
                        .show();

            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            String getEventTimeSubStringHour = temp.substring(0, 2);
            String getEventTimeSubStringMinute = temp.substring(3, 5);
            String getEventDateSubStringDay = temp2.substring(0, 2);
            String getEventDateSubStringMonth = temp2.substring(3, 5);
            String getEventDateSubStringYear = temp2.substring(6, 10);
            Toast.makeText(
                    this,
                    getEventTimeSubStringHour + " "
                            + getEventTimeSubStringMinute + " "
                            + getEventDateSubStringDay + " "
                            + getEventDateSubStringMonth + " "
                            + getEventDateSubStringYear, Toast.LENGTH_LONG)
                    .show();
            hourOfDay = Integer.parseInt(getEventTimeSubStringHour);
            minute = Integer.parseInt(getEventTimeSubStringMinute);
            day = Integer.parseInt(getEventDateSubStringDay);
            month = Integer.parseInt(getEventDateSubStringMonth);
            year = Integer.parseInt(getEventDateSubStringYear);
            int second = 0;
//          calendar.setTimeInMillis(System.currentTimeMillis());
//          calendar.clear();
            //calendar.set(year, month, day);
            calendar.set(Calendar.YEAR, year);
            calendar.set(Calendar.MONTH, month);
            calendar.set(Calendar.DAY_OF_MONTH, day);
            calendar.set(Calendar.HOUR_OF_DAY, hourOfDay);
            calendar.set(Calendar.MINUTE, minute);
            calendar.set(Calendar.SECOND, second);


            Intent intent = new Intent(MessageService.this,
                    ServiceManager.class);
            PendingIntent callToServiceManager = PendingIntent.getService(
                    MessageService.this, 2, intent, 0);
            AlarmManager alarmToCallServiceManager = (AlarmManager) getSystemService(ALARM_SERVICE);
            alarmToCallServiceManager.set(AlarmManager.RTC_WAKEUP,
                    calendar.getTimeInMillis(), callToServiceManager);

Incluso después de usar calendar.set(year, month, day, hourOfDay, minute, second) nada esta pasando. ¡Por favor ayuda! ¡Gracias!