From fbc7598a6bd238cc1ccd892dbf8e446f78fdfb0d Mon Sep 17 00:00:00 2001
From: Eric Lippmann <eric.lippmann@icinga.com>
Date: Thu, 15 Nov 2018 09:17:42 +0100
Subject: [PATCH] JS: Simplify Date.getStdTimezoneOffset()

refs #3607
---
 public/js/icinga/timezone.js | 20 +++-----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/public/js/icinga/timezone.js b/public/js/icinga/timezone.js
index 7e695248f..3c0fb090a 100644
--- a/public/js/icinga/timezone.js
+++ b/public/js/icinga/timezone.js
@@ -10,25 +10,11 @@
      * @returns {Number}
      */
     Date.prototype.getStdTimezoneOffset = function() {
-        if (Date.maxTimezoneOffset !== undefined) {
-            return Date.maxTimezoneOffset;
-        }
-
         var year = new Date().getFullYear();
-        var previousOffset;
+        var offsetInJanuary = new Date(year, 0, 2).getTimezoneOffset();
+        var offsetInJune = new Date(year, 5, 2).getTimezoneOffset();
 
-        for (var i=0; i<12; i++) {
-            var d = new Date(year, i, 1);
-            if (previousOffset !== undefined) {
-                previousOffset = Math.max(previousOffset, d.getTimezoneOffset());
-            } else {
-                previousOffset = d.getTimezoneOffset();
-            }
-        }
-
-        Date.maxTimezoneOffset = previousOffset;
-
-        return Date.maxTimezoneOffset;
+        return Math.max(offsetInJanuary, offsetInJune);
     };
 
     /**