I set an alarm to repeat everyday. but it will have a few seconds or minutes error. How can I make it more accurate?

PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), notificationId, myIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager alarmManager = (AlarmManager)getActivity().getSystemService(Context.ALARM_SERVICE);
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, 12);
    calendar.set(Calendar.MINUTE, 30);
    long startUpTime = calendar.getTimeInMillis();
    if (System.currentTimeMillis() > startUpTime) {
        startUpTime = startUpTime + 24*60*60*1000;
    }
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, startUpTime,  24*60*60*1000 , pendingIntent);

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