JAVA日期操作(转)

Calendar   calendar   =   new   GregorianCalendar();  
    System.out.println("YEAR:   "     calendar.get(Calendar.YEAR));   //得到当前年
    System.out.println("MONTH:   "     calendar.get(Calendar.MONTH));   //得到当前月
    System.out.println("WEEK_OF_YEAR:   "     calendar.get(Calendar.WEEK_OF_YEAR));   //得到当前年中的第几周
    System.out.println("WEEK_OF_MONTH:   "     calendar.get(Calendar.WEEK_OF_MONTH));   //得到当前月中的第几周
    System.out.println("DATE:   "     calendar.get(Calendar.DATE));   //得到当前日期
    System.out.println("DAY_OF_MONTH:   "     calendar.get(Calendar.DAY_OF_MONTH));   //得到当前日期
    System.out.println("DAY_OF_YEAR:   "     calendar.get(Calendar.DAY_OF_YEAR));  
    System.out.println("DAY_OF_WEEK:   "     calendar.get(Calendar.DAY_OF_WEEK));  
    System.out.println("DAY_OF_WEEK_IN_MONTH:   "  
                                            calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));  
    System.out.println("AM_PM:   "     calendar.get(Calendar.AM_PM));  
    System.out.println("HOUR:   "     calendar.get(Calendar.HOUR));  
    System.out.println("HOUR_OF_DAY:   "     calendar.get(Calendar.HOUR_OF_DAY));  
    System.out.println("MINUTE:   "     calendar.get(Calendar.MINUTE));  
    System.out.println("SECOND:   "     calendar.get(Calendar.SECOND));  
    System.out.println("MILLISECOND:   "     calendar.get(Calendar.MILLISECOND));