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These changes conforms to the C11 standard References: - 7.27.1/3 Components of time (struct timespec) - 7.27.2.5 The timespec_get function According to ISO/IEC 9899:201x (draft) <time.h> defines the timespec structure and declares the timespec_get(3) function with TIME_UTC definition. According to a C++17 standard draft <ctime> offers the same interface in the std:: namespace. The timespec_get function modifies the timespec object pointed by ts to hold the current calendar time in the given base. The standard notes only the TIME_UTC base with implementation defined value, set it to 1 as zero is reserved for error handling. Once operation was successful this function returns passed base, otherwise exits with zero. The timespec struct was already part of the POSIX standard in <time.h>. Enable this interface unconditionally in the header to allow to use it in a code prior C11 and C++17 as an extension. Review notes from <christos>