Set job timestamp to ISO 8601 format so it can be properly 'relatized' by Resque-web

Author: richardkmiller

lib/Resque/Worker.php

@@ -486,7 +486,7 @@ public function workingOn(Resque_Job $job)
 		$job->updateStatus(Resque_Job_Status::STATUS_RUNNING);
 		$data = json_encode(array(
 			'queue' => $job->queue,
-			'run_at' => strftime('%a %b %d %H:%M:%S %Z %Y'),
+			'run_at' => date('c'),
 			'payload' => $job->payload
 		));
 		Resque::redis()->set('worker:' . $job->worker, $data);