Calendar 的使用

Calendar cal = Calendar.getInstance();

        //当前年
        int year = cal.get(Calendar.YEAR);


        //当前月
        int month = (cal.get(Calendar.MONTH))+1;


        //当前月的第几天：即当前日
        int day_of_month = cal.get(Calendar.DAY_OF_MONTH);


        //当前时：HOUR_OF_DAY-24小时制；HOUR-12小时制
        int hour = cal.get(Calendar.HOUR_OF_DAY);


        //当前分
        int minute = cal.get(Calendar.MINUTE);


        //当前秒
        int second = cal.get(Calendar.SECOND);


        //0-上午；1-下午
        int ampm = cal.get(Calendar.AM_PM);


        //当前年的第几周
        int week_of_year = cal.get(Calendar.WEEK_OF_YEAR);


        //当前月的第几周
        int week_of_month = cal.get(Calendar.WEEK_OF_MONTH);


        //当前年的第几天
        int day_of_year = cal.get(Calendar.DAY_OF_YEAR);