VMS Help CC, Language topics, Predefined Macros, TIME  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The __TIME__ macro evaluates to a string specifying the time that
  the compilation started.  The time has the following format:

       hh:mm:ss

  Example:

       printf("%s", __TIME__);

  The value of this macro remains constant throughout the translation
  unit.