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  https://lists.gnu.org/archive/html/emacs-devel/2015-11/msg01547.html

Support bit-for-bit reproducible generation of autoloads.
See <https://reproducible-builds.org/specs/source-date-epoch/>.
Submitted on behalf of Alex Kost.

* lisp/emacs-lisp/autoload.el (autoload-insert-section-header): Check
whether the 'SOURCE_DATE_EPOCH' environment variable is defined; use it
as the TIME part of the 'autoloads' sexp when it is.