diff --git a/debian/rules b/debian/rules
index be2f94f..1a4c426 100755
--- a/debian/rules
+++ b/debian/rules
@@ -1,4 +1,8 @@
 #!/usr/bin/make -f
+
+BUILD_DATE = $(shell dpkg-parsechangelog --show-field Date)
+BUILD_DATE_FORMATTED = $(shell LC_ALL=C date --utc --date="$(BUILD_DATE)" "+%B %d, %Y")
+
 %:
 	dh $@ --with phpcomposer,sphinxdoc
 
@@ -6,7 +10,7 @@ override_dh_auto_build:
 	phpab	--output src/autoload.php \
 		--template debian/autoload.php.tpl \
 		src
-	$(MAKE) -C docs html latexpdf
+	$(MAKE) SPHINXOPTS="-D today="$(TODAY)"" -C docs html latexpdf
 	mkdir --parents vendor
 	phpab	--output vendor/autoload.php \
 		--basedir vendor \