将日历设置为特定日期？

我想设置一个提醒，并在特定日期发出通知。然后我目前正在使用 AlarmManager 和 NotificationManager 。当我从 dateDialog 设置选定的日期时，提醒起作用了。如何将日历值设置为固定时间的闹钟？我从中获取当前日期和时间：

Calendar calendar =  Calendar.getInstance();

然后我可以像下面一样手动设置日历并且它可以工作：

calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MINUTE, 13);
calendar.set(Calendar.HOUR, 7);
calendar.set(Calendar.AM_PM, Calendar.AM);
calendar.set(Calendar.MONTH, Calendar.JANUARY);
calendar.set(Calendar.DAY_OF_MONTH, 8);
calendar.set(Calendar.YEAR,2015);
long when = calendar.getTimeInMillis();

但我的问题是如何将日历设置为明天和上午 9:00，或者将日历精确设置为当前日期之后的特定月份（或年份）？我的意思是这样的：

calendar.add(Calendar.DAY_OF_MONTH, 1);

但它不起作用。

For me this works just fine on the desktop, couldn't test it on Android though.
Update: just tested this on my Android phone using AIDE, getting the exact same results.

import java.util.Calendar;

public class CalendarTest {

    public static void main(String[] args) {

        Calendar calendar = Calendar.getInstance();

        System.out.println(calendar.getTimeInMillis() + " -> " + calendar.getTime());

        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MINUTE, 13);
        calendar.set(Calendar.HOUR, 7);
        calendar.set(Calendar.AM_PM, Calendar.AM);
        calendar.set(Calendar.MONTH, Calendar.JANUARY);
        calendar.set(Calendar.DAY_OF_MONTH, 9);
        calendar.set(Calendar.YEAR, 2015);

        System.out.println(calendar.getTimeInMillis() + " -> " + calendar.getTime());

        calendar.add(Calendar.DAY_OF_MONTH, 1);
        calendar.add(Calendar.YEAR, 1);

        System.out.println(calendar.getTimeInMillis() + " -> " + calendar.getTime());
    }

对于此测试，我的输出正是您所期望的：

1420705649927 -> Thu Jan 08 09:27:29 CET 2015
1420783980927 -> Fri Jan 09 07:13:00 CET 2015
1452406380927 -> Sun Jan 10 07:13:00 CET 2016