diff --git a/sigil.changes b/sigil.changes
index 88e30b7..bf4bc47 100644
--- a/sigil.changes
+++ b/sigil.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Fri Sep 21 18:47:29 UTC 2018 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Drop build date from build output (boo#1047218)
+- Fix % escaping where %H:%M:%S turned into 17:53:56OURCE
+
 -------------------------------------------------------------------
 Thu Aug 16 09:10:33 UTC 2018 - jengelh@inai.de
 
diff --git a/sigil.spec b/sigil.spec
index a627fa7..f9f1536 100644
--- a/sigil.spec
+++ b/sigil.spec
@@ -86,26 +86,27 @@ specification and create a hierarchical Table of Contents.
 
 %prep
 %setup -q -n Sigil-%{version}
-sed -i 's/\r//' ChangeLog.txt README.md COPYING.txt
 %patch0 -p 1
 cp -v %{S:1} .
 cp -v %{S:2} .
 # rpmlint
-dos2unix src/Resource_Files/python3lib/meta*.py
-dos2unix src/Resource_Files/python3lib/opf_*.py
-find . -type f -exec sed -i -e 's|#!\/usr\/bin\/env python|#!\/usr\/bin\/python3|g' {} +
 
 #FIXME MANUAL UPDATE OF DATE REQUIRED HERE!!!!
 # Fix "Your file uses  __DATE and __TIME__ this causes the package to rebuild 
 # when not needed warning"
 # http://sourceforge.net/tracker/?func=detail&atid=102439&aid=3314371&group_id=2439
 #
-# We use the current date
-_date=$(date +"%Y%m%d")
-_time=$(date +"%H:%M:%S")
+# We use the ChangeLog date
+_date=$(date -u -r ChangeLog.txt -I)
+_time=$(date -u -r ChangeLog.txt +%%T)
 # Change it:
 find . -type f -name About.cpp -exec sed -i "s/@DATE@/$_date/;s/@TIME@/$_time/g" {} +
 
+sed -i 's/\r//' ChangeLog.txt README.md COPYING.txt
+dos2unix src/Resource_Files/python3lib/meta*.py
+dos2unix src/Resource_Files/python3lib/opf_*.py
+find . -type f -exec sed -i -e 's|#!\/usr\/bin\/env python|#!\/usr\/bin\/python3|g' {} +
+
 %build
 export CFLAGS="%{optflags} -fno-strict-aliasing"
 export CXXFLAGS="$CFLAGS"