Corrected Timezone detection by using jstz external library

COPYRIGHT

@@ -47,6 +47,7 @@ jQuery TableDnD        0.6           GPL and MIT License         Yes
 jQuery Timepicker      1.1.0         GPL and MIT License         Yes             JS library Timepicker addon for Datepicker
 jQuery Tiptip          1.3           GPL and MIT License         Yes             JS library for tooltips
 jsGantt                1.2           BSD License                 Yes             JS library (to build Gantt reports)
+JsTimezoneDetect      1.0.4     MIT Licence                 Yes             JS library to detect user timezone
 
 For licenses compatibility informations:
 http://www.fsf.org/licensing/licenses/index_html

htdocs/core/js/dst.js

@@ -1,5 +1,6 @@
 // Copyright (C) 2011-2014	Laurent Destailleur	<eldy@users.sourceforge.net>
 // Copyright (C) 2011-2012	Regis Houssin		<regis.houssin@capnetworks.com>
+// Copyright (C) 2015       Marcos García       <marcosgdf@gmail.com>
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -23,7 +24,10 @@
 //
 
 $(document).ready(function () {
-	// Detect and save TZ and DST
+
+    var timezone = jstz.determine();
+
+    // Detect and save TZ and DST
 	var rightNow = new Date();
 	var jan1 = new Date(rightNow.getFullYear(), 0, 1, 0, 0, 0, 0);
 	var temp = jan1.toGMTString();
@@ -40,16 +44,12 @@ $(document).ready(function () {
 	    dst = "1"; // daylight savings time is observed
 	}
 	var now=new Date();
-	var tz=now.toTimeString().match(/\(.*\)/);	// now.toTimeString may return "12:39:59 GMT+0200 (CEST)"
 	//alert('date=' + now + ' string=' + now.toTimeString());
 	var dst_first=DisplayDstSwitchDates('first');
 	var dst_second=DisplayDstSwitchDates('second');
 	//alert(dst);
 	$('#tz').val(std_time_offset);   				  					// returns TZ
-	// tz is null with IE 
-	if (tz != null) {
-		$('#tz_string').val(tz[0].replace('(','').replace(')',''));		// returns TZ string
-	}
+    $('#tz_string').val(timezone.name());		// returns TZ string
 	$('#dst_observed').val(dst);   				  						// returns if DST is observed on summer
 	$('#dst_first').val(dst_first);   									// returns DST first switch in year
 	$('#dst_second').val(dst_second);   								// returns DST second switch in year

htdocs/core/tpl/login.tpl.php

@@ -28,7 +28,11 @@ if (GETPOST('dol_use_jmobile')) $conf->dol_use_jmobile=1;
 // If we force to use jmobile, then we reenable javascript
 if (! empty($conf->dol_use_jmobile)) $conf->use_javascript_ajax=1;
 
-$arrayofjs=array('/core/js/dst.js'.(empty($conf->dol_use_jmobile)?'':'?version='.urlencode(DOL_VERSION)));					// Javascript code on logon page only to detect user tz, dst_observed, dst_first, dst_second
+// Javascript code on logon page only to detect user tz, dst_observed, dst_first, dst_second
+$arrayofjs=array(
+	'/includes/jstz/jstz.min.js'.(empty($conf->dol_use_jmobile)?'':'?version='.urlencode(DOL_VERSION)),
+	'/core/js/dst.js'.(empty($conf->dol_use_jmobile)?'':'?version='.urlencode(DOL_VERSION))
+);
 $titleofloginpage=$langs->trans('Login').' @ '.$title;	// title is defined by dol_loginfunction in security2.lib.php. We must keep the @, some tools use it to know it is login page.
 
 print top_htmlhead('',$titleofloginpage,0,0,$arrayofjs);