--- a/debian/rules	2020-04-11 19:34:20.623411284 +0100
--- b/debian/rules	2020-04-11 19:37:43.510924382 +0100
@@ -1,7 +1,7 @@
 #!/usr/bin/make -f
 
 export DEB_BUILD_MAINT_OPTIONS = hardening=+all
-export BUILD_DATE = $(shell dpkg-parsechangelog -SDate | date -f- +"%Y-%m-%d")
+export BUILD_DATE = $(shell date -u -d@$(SOURCE_DATE_EPOCH) +"%Y-%m-%d")
 PYTEST_VERSION = $(shell python3 -c 'import sys ; print("py" + "".join([str(i) for i in sys.version_info[:2]]))')
 
 %: