How is the result struct of localtime allocated in C?

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The pointer returned by localtime (and some other functions) are actually pointers to statically allocated memory. So you do not need to free it, and you should not free it.

http://www.cplusplus.com/reference/clibrary/ctime/localtime/

This structure is statically allocated and shared by the functions
gmtime and localtime. Each time either one of these functions is
called the content of this structure is overwritten.

EDIT : Appending a few things mentioned in the comments.

A direct result of this shared data-structure is that localtime and similar functions are not thread-safe. The thread-safe solution varies with different platforms. localtime_r for POSIX and localtime_s for MSVC.

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