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+/*! Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+(function(Icinga, $) {
+
+ 'use strict';
+
+ /**
+ * Get the maximum timezone offset
+ *
+ * @returns {Number}
+ */
+ Date.prototype.getStdTimezoneOffset = function() {
+ var year = new Date().getFullYear();
+ var offsetInJanuary = new Date(year, 0, 2).getTimezoneOffset();
+ var offsetInJune = new Date(year, 5, 2).getTimezoneOffset();
+
+ return Math.max(offsetInJanuary, offsetInJune);
+ };
+
+ /**
+ * Test for daylight saving time zone
+ *
+ * @returns {boolean}
+ */
+ Date.prototype.isDst = function() {
+ return this.getStdTimezoneOffset() !== this.getTimezoneOffset();
+ };
+
+ /**
+ * Write timezone information into a cookie
+ *
+ * @constructor
+ */
+ Icinga.Timezone = function() {
+ this.cookieName = 'icingaweb2-tzo';
+ };
+
+ Icinga.Timezone.prototype = {
+ /**
+ * Initialize interface method
+ */
+ initialize: function () {
+ this.writeTimezone();
+ },
+
+ destroy: function() {
+ // PASS
+ },
+
+ /**
+ * Write timezone information into cookie
+ */
+ writeTimezone: function() {
+ var date = new Date();
+ var timezoneOffset = (date.getTimezoneOffset()*60) * -1;
+ var dst = date.isDst();
+
+ if (this.readCookie(this.cookieName)) {
+ return;
+ }
+
+ this.writeCookie(this.cookieName, timezoneOffset + '-' + Number(dst), 1);
+ },
+
+ /**
+ * Write cookie data
+ *
+ * @param {String} name
+ * @param {String} value
+ * @param {Number} days
+ */
+ writeCookie: function(name, value, days) {
+ var expires = '';
+
+ if (days) {
+ var date = new Date();
+ date.setTime(date.getTime()+(days*24*60*60*1000));
+ var expires = '; expires=' + date.toGMTString();
+ }
+ document.cookie = name + '=' + value + expires + '; path=/';
+ },
+
+ /**
+ * Read cookie data
+ *
+ * @param {String} name
+ * @returns {*}
+ */
+ readCookie: function(name) {
+ var nameEq = name + '=';
+ var ca = document.cookie.split(';');
+ for(var i=0;i < ca.length;i++) {
+ var c = ca[i];
+ while (c.charAt(0)==' ') {
+ c = c.substring(1,c.length);
+ }
+ if (c.indexOf(nameEq) == 0) {
+ return c.substring(nameEq.length,c.length);
+ }
+ }
+ return null;
+ }
+ };
+
+})(Icinga, jQuery);