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);