How do I set alarm before specific time in android studio?

Question

My codes

calendar = Calendar.getInstance();
    calendar.set(Calendar.MONTH, month);
    calendar.set(Calendar.YEAR, year);
    calendar.set(Calendar.DAY_OF_MONTH, date);

    long eventTime=calendar.getTimeInMillis();

    long oneDay=AlarmManager.INTERVAL_DAY;
    int noOfDays=4;
    long reminderTime=eventTime-(noOfDays*oneDay);

    Intent myIntent = new Intent(Home.this, MyBroadcast.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(Home.this, 0, myIntent,0);
    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, reminderTime, pendingIntent);

I tried everything but It will ring right on I setting it !

Answer 1

You need to use Gregorian calendar,

Gregorian calender Calendar cur_cal = new GregorianCalendar();
cur_cal.setTimeInMillis(System.currentTimeMillis());