This tutorial also shows how to use scalar functions to calculate and extract date information, such as day of week and month name, from date columns.

本教程还展示如何使用标量函数从date列计算和提取信息，例如星期几和月份。

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Date class whose member variables are: year, month, day, member functions are: output date function, set the date function, and interpretation of leap year and leap year date plus 1 function function.

详细说明：Date类，其成员变量有：年、月、日，成员函数有：输出日期函数、设置日期函数、判读平年与润年函数和日期加1函数。

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Date class whose member variables are: year, month, day, member functions are: output date function, set the date function, and interpretation of leap year and leap year date plus 1 function function.

详细说明：Date类，其成员变量有：年、月、日，成员函数有：输出日期函数、设置日期函数、判读平年与润年函数和日期加1函数。

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