Include last commit date in filename when packaging the html manual

src/Makefile

@@ -6,6 +6,7 @@ DISTCLEANLANGS = $(patsubst manual-%,dist-clean-%,$(LANGS))
 # Be rather specific with '--git-dir' as we do not want to pick up an unrelated
 # outer Git repository in case the TeXworks manual sources come from an archive.
 GIT_COMMIT = $(shell LANG=C; git --git-dir=../.git rev-parse --short HEAD)
+GIT_DATE = $(subst -,,$(word 1, $(shell LANG=C; git --git-dir=../.git show -s --pretty=%ci HEAD)))
 
 .PHONY : all clean dist dist-clean $(LANGS) $(DISTLANGS) $(CLEANLANGS) $(DISTCLEANLANGS)
 
@@ -14,7 +15,7 @@ all : $(LANGS)
 clean : $(CLEANLANGS)
 
 dist : $(DISTLANGS)
-	cd ../html && zip -r TeXworks-manual-html-$(GIT_COMMIT).zip TeXworks-manual
+	cd ../html && zip -r TeXworks-manual-html-$(GIT_DATE)-$(GIT_COMMIT).zip TeXworks-manual
 
 dist-clean : $(DISTCLEANLANGS)