Use timestamp variable in the status field of the benchmark.

Author: ggbecker

ssg/build_yaml.py

@@ -742,10 +742,7 @@ def _create_benchmark_xml_skeleton(self, env_yaml):
         root.set('xml:lang', 'en-US')
 
         status = ET.SubElement(root, '{%s}status' % XCCDF12_NS)
-        status.set(
-            'date',
-            time.strftime("%Y-%m-%d",
-                          time.gmtime(int(os.environ.get('SOURCE_DATE_EPOCH', time.time())))))
+        status.set('date', timestamp)
         status.text = self.status
 
         add_sub_element(root, "title", XCCDF12_NS, self.title)