From d68fbdbb5b2db994d4b517c68798c14e1183df30 Mon Sep 17 00:00:00 2001
From: Tim Wood <washwithcare@gmail.com>
Date: Sat, 11 May 2013 19:39:36 +0200
Subject: [PATCH] adding isDST teste

---
 moment.js            |  5 +++--
 test/moment/zones.js | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/moment.js b/moment.js
index 954091b48..267aba5ae 100644
--- a/moment.js
+++ b/moment.js
@@ -1270,8 +1270,8 @@
         },
 
         isDST : function () {
-            return (this.zone() < moment([this.year()]).zone() ||
-                this.zone() < moment([this.year(), 5]).zone());
+            return (this.zone() < this.clone().month(0).zone() ||
+                this.zone() < this.clone().month(5).zone());
         },
 
         day : function (input) {
@@ -1299,6 +1299,7 @@
                     }
                 }
                 this._d['set' + utc + 'Month'](input);
+                moment.updateOffset(this);
                 return this;
             } else {
                 return this._d['get' + utc + 'Month']();
diff --git a/test/moment/zones.js b/test/moment/zones.js
index abf69126f..8adecbf58 100644
--- a/test/moment/zones.js
+++ b/test/moment/zones.js
@@ -366,6 +366,38 @@ exports.zones = {
 
         moment.updateOffset = oldOffset;
 
+        test.done();
+    },
+
+    "isDST" : function (test) {
+        var oldOffset = moment.updateOffset;
+
+        moment.updateOffset = function (mom) {
+            if (mom.month() > 2 && mom.month() < 9) {
+                mom.zone(-60);
+            } else {
+                mom.zone(0);
+            }
+        };
+
+        test.ok(!moment().month(0).isDST(),  "Jan should not be summer dst");
+        test.ok(moment().month(6).isDST(),   "Jul should be summer dst");
+        test.ok(!moment().month(11).isDST(), "Dec should not be summer dst");
+
+        moment.updateOffset = function (mom) {
+            if (mom.month() > 2 && mom.month() < 9) {
+                mom.zone(0);
+            } else {
+                mom.zone(-60);
+            }
+        };
+
+        test.ok(moment().month(0).isDST(),  "Jan should be winter dst");
+        test.ok(!moment().month(6).isDST(), "Jul should not be winter dst");
+        test.ok(moment().month(11).isDST(), "Dec should be winter dst");
+
+        moment.updateOffset = oldOffset;
+
         test.done();
     }
 
-- 
2.47.2