Calendar.HOUR_OF_DAY显示0 - 12格式

Question

如果我使用以下代码，该程序将无效。 ＆＃39; Hour_Of_Day＆＃39;格式错了。为什么呢？

try {
        Calendar today = Calendar.getInstance();

        today.set(Calendar.HOUR_OF_DAY, 2);
        today.set(Calendar.MINUTE, 0);
        today.set(Calendar.SECOND, 0);
        Timer timer = new Timer();

        // Schedule to run every Sunday in midnight
        timer.schedule(new StarteProzesse(), today.getTime(), TimeUnit.MILLISECONDS.convert(1, TimeUnit.DAYS));
    } catch (Exception e) {

        e.printStackTrace();
    }