此程序为Calender（万年历），用来显示一年中的日期，计算某一天在一个星期中是星期几，计算两个日期间所隔天数。内附报告-This procedure for the the Calender (calendar), is used to display the date in the year, calculated one day in a week is the week to calculate the next day, the number two dates. Enclosing