From 65082b3adbfaa04c4aff7c41147bb43e34941106 Mon Sep 17 00:00:00 2001
From: thomascube <thomas@roundcube.net>
Date: Wed, 28 Sep 2011 07:49:37 -0400
Subject: [PATCH] Distinguish standard timezone offset and DST of client
---
program/js/common.js | 17 +++++++++++++++++
1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/program/js/common.js b/program/js/common.js
index f69125b..831e44a 100644
--- a/program/js/common.js
+++ b/program/js/common.js
@@ -671,6 +671,23 @@
return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};
+// Extend Date prototype to detect Standard timezone without DST
+// from http://www.michaelapproved.com/articles/timezone-detect-and-ignore-daylight-saving-time-dst/
+Date.prototype.getStdTimezoneOffset = function()
+{
+ var m = 12,
+ d = new Date(null, m, 1),
+ tzo = d.getTimezoneOffset();
+
+ while (--m) {
+ d.setUTCMonth(m);
+ if (tzo != d.getTimezoneOffset()) {
+ return Math.max(tzo, d.getTimezoneOffset());
+ }
+ }
+
+ return tzo;
+}
// Make getElementById() case-sensitive on IE
if (bw.ie)
--
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