Use correct dates

update_repo.sh

@@ -4,7 +4,7 @@ SOURCE_PATH=/tmp/fdroid
 cd $SOURCE_PATH
 mkdir -p $SOURCE_PATH/repo/
 while true; do
-  s3cmd sync $APP $SOURCE_PATH/repo/
+  s3cmd sync --preserve $APP $SOURCE_PATH/repo/
   rm -rf $SOURCE_PATH/repo/*-latest.apk
   fdroid update && fdroid server update
   sleep $UPDATE_WAIT