alarmmanager.rtc_wakeup

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public void setAlarm(){                   int year = 2012;                 int month = 10;                 int day = 20;                 int hour = 15;                 int minute = 30;           AlarmManager alarm = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);         Intent intent = new Intent(MainActivity.this, AlarmRecever.class);         PendingIntent pender = PendingIntent.getBroadcast(MainActivity.this, 0, intent, 0);         Calendar calendar = Calendar.getInstance();         calendar.set(year, month - 1, day, hour, minute);         alarm.set(알람타입, calendar.getTimeInMillis(), pender); }

I think you have problem in your "cal1" object;
When you set time in calendar object, actually setting Month, you should not use exact numeric value of month;
ex: - April = 4, you must use 3 instead of 4
I face this problem in API Level 19, but don't know about others.
This Question may give you better explanation.Why month give wrong value

public Calendar c = Calendar.getInstance();
                c.set(Calendar.YEAR,2014);
                c.set(Calendar.MONTH, 03);//One minus from actual month numeric value
                c.set(Calendar.DATE, 24);
                c.set(Calendar.HOUR_OF_DAY,16 );                
                c.set(Calendar.MINUTE, 39);
                  c.set(Calendar.SECOND, 0);
am.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(),pi);