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(elisp)Version Info

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Version Information
===================

   These facilities provide information about which version of Emacs is
in use.

 - Command: emacs-version
     This function returns a string describing the version of Emacs
     that is running.  It is useful to include this string in bug
     reports.

          (emacs-version)
            => "GNU Emacs 20.3.5 (i486-pc-linux-gnulibc1, X toolkit)
           of Sat Feb 14 1998 on psilocin.gnu.org"

     Called interactively, the function prints the same information in
     the echo area.

 - Variable: emacs-build-time
     The value of this variable indicates the time at which Emacs was
     built at the local site.  It is a list of three integers, like the
     value of `current-time' (Note: Time of Day).

          emacs-build-time
               => (13623 62065 344633)

 - Variable: emacs-version
     The value of this variable is the version of Emacs being run.  It
     is a string such as `"20.3.1"'.  The last number in this string is
     not really part of the Emacs release version number; it is
     incremented each time you build Emacs in any given directory.  A
     value with four numeric components, such as `"20.3.9.1"',
     indicates an unreleased test version.

   The following two variables have existed since Emacs version 19.23:

 - Variable: emacs-major-version
     The major version number of Emacs, as an integer.  For Emacs
     version 20.3, the value is 20.

 - Variable: emacs-minor-version
     The minor version number of Emacs, as an integer.  For Emacs
     version 20.3, the value is 3.