Merge branch 'fc/doc-use-datestamp-in-commit'

Instead of the time the formatter was run, show the timestamp
recorded in the commit in the documentation.

* fc/doc-use-datestamp-in-commit:
  doc: set actual revdate for manpages

Author: gitster

Documentation/Makefile

@@ -144,13 +144,16 @@ man5dir = $(mandir)/man5
 man7dir = $(mandir)/man7
 # DESTDIR =
 
+GIT_DATE := $(shell git show --quiet --pretty='%as')
+
 ASCIIDOC = asciidoc
 ASCIIDOC_EXTRA =
 ASCIIDOC_HTML = xhtml11
 ASCIIDOC_DOCBOOK = docbook
 ASCIIDOC_CONF = -f asciidoc.conf
 ASCIIDOC_COMMON = $(ASCIIDOC) $(ASCIIDOC_EXTRA) $(ASCIIDOC_CONF) \
-		-amanmanual='Git Manual' -amansource='Git $(GIT_VERSION)'
+		-amanmanual='Git Manual' -amansource='Git $(GIT_VERSION)' \
+		-arevdate='$(GIT_DATE)'
 ASCIIDOC_DEPS = asciidoc.conf GIT-ASCIIDOCFLAGS
 TXT_TO_HTML = $(ASCIIDOC_COMMON) -b $(ASCIIDOC_HTML)
 TXT_TO_XML = $(ASCIIDOC_COMMON) -b $(ASCIIDOC_DOCBOOK)