/sys$common/syshlp/helplib.hlb CC, Run-time functions, strftime  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Uses date and time information stored in a tm structure to create
  an output string.  The format of the output string is controlled by
  a format string.

  Syntax:

       #include <time.h>

       size_t strftime(char *str, size_t maxsize, const char *format,
                       const struct tm *timeptr);