Java Calendar日历类的使用

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);