From a21fcf6f879b4edd89acfae86d0f23f839791756 Mon Sep 17 00:00:00 2001
From: harttle <harttle@harttle.com>
Date: Fri, 8 Dec 2017 10:42:00 +0800
Subject: [PATCH] fix: compatible to nodejs<=4

---
 filters.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/filters.js b/filters.js
index 32551f7c4..1f5e9f373 100644
--- a/filters.js
+++ b/filters.js
@@ -24,7 +24,7 @@ var filters = {
   'ceil': v => Math.ceil(v),
   'concat': (v, arg) => Array.prototype.concat.call(v, arg),
   'date': (v, arg) => {
-    let date = v
+    var date = v
     if (v === 'now') {
       date = new Date()
     } else if (_.isString(v)) {