通知显示在指定时间之后

Question

我每天都会设置重复的通知，如下所示：

    Calendar alarmFor = Calendar.getInstance();
    alarmFor.set(Calendar.HOUR_OF_DAY, 15);
    alarmFor.set(Calendar.MINUTE, 12);
    alarmFor.set(Calendar.SECOND, 0);

    Intent MyIntent = new Intent(context, AlarmManag.class);
    PendingIntent MyPendIntent = PendingIntent.getBroadcast(context, 0, MyIntent, PendingIntent.FLAG_CANCEL_CURRENT);

    AlarmManager MyAlarm = (AlarmManager)context.getSystemService(ALARM_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        MyAlarm.setRepeating(AlarmManager.RTC_WAKEUP, alarmFor.getTimeInMillis(),  AlarmManager.INTERVAL_DAY, MyPendIntent);
    }       

但是，如果那之后我安装了应用程序，一切都会正常，但安装后我会立即收到通知。 任何想法如何解决？