From b0a4d5a84a64cc887f80213fb8a2f68fc107c324 Mon Sep 17 00:00:00 2001
From: Alexandr Nikitin <alexandr.nikitin@adform.com>
Date: Tue, 3 Mar 2015 12:26:23 +0200
Subject: [PATCH] Fix conversion of date to UTC

Method based on one of SO answers: http://stackoverflow.com/questions/948532/how-do-you-convert-a-javascript-date-to-utc
---
 strftime.js  | 14 ++++++++++----
 test/test.js |  1 +
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/strftime.js b/strftime.js
index cdc5d45..6845863 100644
--- a/strftime.js
+++ b/strftime.js
@@ -279,10 +279,16 @@
     });
   }
 
-  function dateToUTC(d) {
-    var msDelta = (d.getTimezoneOffset() || 0) * 60000;
-    return new Date(d.getTime() + msDelta);
-  }
+    function dateToUTC(d) {
+      return new Date(
+        d.getUTCFullYear(),
+        d.getUTCMonth(),
+        d.getUTCDate(),
+        d.getUTCHours(),
+        d.getUTCMinutes(),
+        d.getUTCSeconds(),
+        d.getUTCMilliseconds());
+    }
 
   var RequiredDateMethods = ['getTime', 'getTimezoneOffset', 'getDay', 'getDate', 'getMonth', 'getFullYear', 'getYear', 'getHours', 'getMinutes', 'getSeconds'];
   function quacksLikeDate(x) {
diff --git a/test/test.js b/test/test.js
index 48572cd..e2f2ec3 100755
--- a/test/test.js
+++ b/test/test.js
@@ -104,6 +104,7 @@ assert.format('%y', '11')
 assert.format('%Z', null, 'GMT')
 assert.format('%z', null, '+0000')
 assert.format('%%', '%') // any other char
+assert.format('%F %T', null, '1970-01-01 00:00:00', new Date(0))
 ok('GMT')