diff --git a/rrdtool.changes b/rrdtool.changes
index 23b0e3f..d40b2b2 100644
--- a/rrdtool.changes
+++ b/rrdtool.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Wed Mar  4 15:35:01 UTC 2015 - kstreitova@suse.com
+
+- modify a %prep phase to replace all timestamps in *.c and *.h
+  with the date and time obtained from the last changelog entry
+  bnc#915946
+
 -------------------------------------------------------------------
 Thu Dec  4 16:40:33 UTC 2014 - kstreitova@suse.com
 
diff --git a/rrdtool.spec b/rrdtool.spec
index 1ad4b9e..785f8bc 100644
--- a/rrdtool.spec
+++ b/rrdtool.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package rrdtool
 #
-# Copyright (c) 2014 SUSE LINUX Products GmbH, Nuernberg, Germany.
+# Copyright (c) 2015 SUSE LINUX GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -161,6 +161,10 @@ pushd "cgilib-%{cgilib_version}"
 %patch11
 popd #cgilib
 %patch12 -p1
+modified="$(sed -n '/^----/n;s/ - .*$//;p;q' "%{_sourcedir}/%{name}.changes")"
+DATE="\"$(date -d "${modified}" "+%%b %%e %%Y")\"" 
+TIME="\"$(date -d "${modified}" "+%%R")\"" 
+find . -name '*.[ch]' | xargs sed -i "s/__DATE__/${DATE}/g;s/__TIME__/${TIME}/g"
 
 %build
 # first prepare cgilib