Output the provisioned date in Y-m-d format.

Change-Id: I67ccd5ec962a6fac6aad23c3cab6d121f4d155e5
diff --git a/export/projects.json.inc b/export/projects.json.inc
index c9f8ea6..d834ee0 100644
--- a/export/projects.json.inc
+++ b/export/projects.json.inc
@@ -32,7 +32,7 @@
 		'dataurl' => $project->getDataUrl(),
 		'licenses' => $project->getLicenses(),
 		'phase' => $project->getProjectPhase(),
-		'provisioned' => $project->getProvisionedDate(),
+		'provisioned' => date('Y-m-d', $project->getProvisionedDate()),
  		'children' => projectsAsArray($project->getChildren())
 	);
 }