--- a/debian/rules	2020-08-13 11:34:56.164335215 +0100
--- b/debian/rules	2020-08-13 11:59:46.372680920 +0100
@@ -6,7 +6,7 @@
 
 # export information for the "About" screen
 include /usr/share/dpkg/pkg-info.mk
-timestamp=$(shell date +%Y-%m-%d -d "@$(SOURCE_DATE_EPOCH)")
+timestamp=$(shell date +%Y-%m-%d -d -u "@$(SOURCE_DATE_EPOCH)")
 export DEB_CXXFLAGS_MAINT_APPEND += -DGIT_TIMESTAMP=\\\"$(timestamp)\\\"
 
 %: