diff --git a/gnome-shell-extension-openweather.spec b/gnome-shell-extension-openweather.spec
index 03f0590..158bd70 100644
--- a/gnome-shell-extension-openweather.spec
+++ b/gnome-shell-extension-openweather.spec
@@ -2,11 +2,12 @@
 %global uuid openweather-extension@jenslody.de
 %global github jenslody-gnome-shell-extension-openweather
 %global checkout git%{git}
+%global checkout_date 20150917
 
 
 Name:           gnome-shell-extension-openweather
 Version:        1
-Release:        0.0.%(date +%Y%m%d)%{checkout}%{?dist}
+Release:        0.0.%{checkout_date}%{checkout}%{?dist}
 Summary:        Display weather information from many locations in the world
 
 Group:          User Interface/Desktops
diff --git a/update_revision.sh b/update_revision.sh
index 5db081b..85edc2c 100755
--- a/update_revision.sh
+++ b/update_revision.sh
@@ -66,8 +66,13 @@ COMMIT=`git log -1 --pretty=format:"%h"`
 
 echo "Found revision: '${COMMIT}'"
 
-mv ${SPEC_FILE} ${SPEC_FILE}.tmp
-sed "1 s/%global git .*/%global git $COMMIT/" < ${SPEC_FILE}.tmp > ${SPEC_FILE}
+DATE=`date +%Y%m%d`
+
+echo "Use checkout-date: '${DATE}'"
+
+cp ${SPEC_FILE} ${SPEC_FILE}.tmp
+sed -i "s/%global git .*/%global git $COMMIT/"  ${SPEC_FILE}
+sed -i "s/%global checkout_date .*/%global checkout_date $DATE/" ${SPEC_FILE}
 
 rpmdev-bumpspec --comment="Fresh git checkout." --userstring="Jens Lody <fedora@jenslody.de>" ${SPEC_FILE}