diff --git a/src/prestart.js b/src/prestart.js
index bfe305fa20..dbc904b3a8 100644
--- a/src/prestart.js
+++ b/src/prestart.js
@@ -15,8 +15,7 @@ function setupWinston() {
 		timestamp: function () {
 			var date = new Date();
 			return nconf.get('json-logging') ? date.toJSON() :
-				date.getDate() + '/' + (date.getMonth() + 1) + ' ' +
-				date.toTimeString().substr(0, 8) + ' [' + global.process.pid + ']';
+				date.toISOString() + ' [' + global.process.pid + ']';
 		},
 		level: nconf.get('log-level') || (global.env === 'production' ? 'info' : 'verbose'),
 		json: !!nconf.get('json-logging'),