Butterfly中Attribute Date类型

在工作流Web系统中，有一个Attribute Date类型的域“myDate”，通过日期选择窗口，选择2010-07-30。在Butterfly脚本中，如果使用bo.getLongField("myDate")，可以得到1280419200000。

        Date date = new Date(2010, 7-1, 30);
        System.out.println(date.getTime()); //61238563200000
       
        date = new Date(2010-1900 , 7-1, 30);
        System.out.println(date.getTime()); //1280419200000
       
        Calendar today = Calendar.getInstance();
        today.clear();
        today.set(Calendar.YEAR, 2010);
        today.set(Calendar.MONTH, 7-1); // from 0 to 11
        today.set(Calendar.DAY_OF_MONTH, 30);
        System.out.println(today.getTimeInMillis()); //1280419200000
       
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, 2010);
        cal.set(Calendar.MONTH, 7-1); // from 0 to 11
        cal.set(Calendar.DAY_OF_MONTH, 30);
        System.out.println(cal.getTimeInMillis()); //1280475572453