android设置闹钟日期 在Android中将闹钟设置为特定日期和时间

请您好好看看这个。我正在设置特定时间和日期的闹钟。它似乎没有工作，我不知道为什么。在Android中将闹钟设置为特定日期和时间

Calendar cal = Calendar.getInstance();

cal.setTimeInMillis(System.currentTimeMillis());

cal.set(Calendar.YEAR, mYear);

cal.set(Calendar.MONTH,mMonth);

cal.set(Calendar.DAY_OF_MONTH,mDay);

cal.set(Calendar.HOUR,mHour);

cal.set(Calendar.MINUTE,mMinutes);

// where mYear, mMonths, mDay, mHour and mMinutes are int values from the Date and Time picker dialogs respectively

Intent activate = new Intent(this, Alarm.class);

PendingIntent alarmIntent = PendingIntent.getBroadcast(this, 0, activate, 0);

alarms = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

alarms.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), alarmIntent);

只是为了让你知道，它的作品，如果我更换cal.getTimeInMillis()与System.CurrentTimeInMillis()在alarms.set()方法。但那显然是我不想要的。谢谢