See strftime(3) for more details.
可以运行strftime（3）来查看详情。
D {string} - string is formatted using the strftime function.
D {string} - string字符串是strftime函数的格式化参数。
The strftime() function has been extended in C99 to provide a few more commonly desired formatting characters.
C99 中对 strftime() 函数进行了扩展，以提供更多常用的格式化字符。
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