diff --git a/lib/metrics.js b/lib/metrics.js
index 399dea903be529ff2d481c04dd602b1b18b087f1..48134aa5f4bd1feee13b39e23a90cd9e1a330fc5 100644
--- a/lib/metrics.js
+++ b/lib/metrics.js
@@ -51,7 +51,8 @@ function setupLogger() {
   var filename = path.join(log_path, configuration.get('process_type') + "-metrics.json");
 
   LOGGER = new (winston.Logger)({
-      transports: [new (winston.transports.File)({filename: filename})]
+      transports: [new (winston.transports.File)({filename: filename})],
+      timestamp: function () { return new Date().toISOString() },
     });
 }