diff --git a/lib/tool.js b/lib/tool.js
index 903a6b6..54bfb89 100644
--- a/lib/tool.js
+++ b/lib/tool.js
@@ -62,7 +62,10 @@ class Tool {
       date: function(str, format = '') {
         //去除参数里多余的引号
         format = format.replace(/^['"]/, '').replace(/['"]$/, '')
-        return gmdate(format, str)
+        if (isFinite(str)) {
+          str = +str
+        }
+        return new Date(str).format(format)
       }
     }
   }