diff --git a/config/timezones.php b/config/timezones.php
new file mode 100644
index 0000000000..0b0e36f8d5
--- /dev/null
+++ b/config/timezones.php
@@ -0,0 +1,125 @@
+<?php
+$timezoneList = array(
+    'Pacific/Midway'                   => '(UTC-11:00) Midway Island',
+    'Pacific/Samoa'                    => '(UTC-11:00) Samoa',
+    'Pacific/Honolulu'                 => '(UTC-10:00) Hawaii',
+    'US/Alaska'                        => '(UTC-09:00) Alaska',
+    'America/Los_Angeles'              => '(UTC-08:00) Pacific Time (US &amp; Canada)',
+    'America/Tijuana'                  => '(UTC-08:00) Tijuana',
+    'US/Arizona'                       => '(UTC-07:00) Arizona',
+    'America/Chihuahua'                => '(UTC-07:00) Chihuahua',
+    'America/Mazatlan'                 => '(UTC-07:00) Mazatlan',
+    'US/Mountain'                      => '(UTC-07:00) Mountain Time (US &amp; Canada)',
+    'America/Managua'                  => '(UTC-06:00) Central America',
+    'US/Central'                       => '(UTC-06:00) Central Time (US &amp; Canada)',
+    'America/Mexico_City'              => '(UTC-06:00) Mexico City',
+    'America/Monterrey'                => '(UTC-06:00) Monterrey',
+    'Canada/Saskatchewan'              => '(UTC-06:00) Saskatchewan',
+    'America/Bogota'                   => '(UTC-05:00) Bogota',
+    'US/Eastern'                       => '(UTC-05:00) Eastern Time (US &amp; Canada)',
+    'US/East-Indiana'                  => '(UTC-05:00) Indiana (East)',
+    'America/Lima'                     => '(UTC-05:00) Lima',
+    'Canada/Atlantic'                  => '(UTC-04:00) Atlantic Time (Canada)',
+    'America/Caracas'                  => '(UTC-04:30) Caracas',
+    'America/La_Paz'                   => '(UTC-04:00) La Paz',
+    'America/Santiago'                 => '(UTC-04:00) Santiago',
+    'Canada/Newfoundland'              => '(UTC-03:30) Newfoundland',
+    'America/Sao_Paulo'                => '(UTC-03:00) Brasilia',
+    'America/Argentina/Buenos_Aires'   => '(UTC-03:00) Buenos Aires',
+    'America/Godthab'                  => '(UTC-03:00) Greenland',
+    'America/Noronha'                  => '(UTC-02:00) Mid-Atlantic',
+    'Atlantic/Azores'                  => '(UTC-01:00) Azores',
+    'Atlantic/Cape_Verde'              => '(UTC-01:00) Cape Verde Is.',
+    'Africa/Casablanca'                => '(UTC+00:00) Casablanca',
+    'Etc/Greenwich'                    => '(UTC+00:00) Greenwich Mean Time : Dublin',
+    'Europe/Lisbon'                    => '(UTC+00:00) Lisbon',
+    'Europe/London'                    => '(UTC+00:00) London',
+    'Africa/Monrovia'                  => '(UTC+00:00) Monrovia',
+    'UTC'                              => '(UTC+00:00) UTC',
+    'Europe/Amsterdam'                 => '(UTC+01:00) Amsterdam',
+    'Europe/Belgrade'                  => '(UTC+01:00) Belgrade',
+    'Europe/Berlin'                    => '(UTC+01:00) Berlin',
+    'Europe/Bratislava'                => '(UTC+01:00) Bratislava',
+    'Europe/Brussels'                  => '(UTC+01:00) Brussels',
+    'Europe/Budapest'                  => '(UTC+01:00) Budapest',
+    'Europe/Copenhagen'                => '(UTC+01:00) Copenhagen',
+    'Europe/Ljubljana'                 => '(UTC+01:00) Ljubljana',
+    'Europe/Madrid'                    => '(UTC+01:00) Madrid',
+    'Europe/Paris'                     => '(UTC+01:00) Paris',
+    'Europe/Prague'                    => '(UTC+01:00) Prague',
+    'Europe/Rome'                      => '(UTC+01:00) Rome',
+    'Europe/Sarajevo'                  => '(UTC+01:00) Sarajevo',
+    'Europe/Skopje'                    => '(UTC+01:00) Skopje',
+    'Europe/Stockholm'                 => '(UTC+01:00) Stockholm',
+    'Europe/Vienna'                    => '(UTC+01:00) Vienna',
+    'Europe/Warsaw'                    => '(UTC+01:00) Warsaw',
+    'Africa/Lagos'                     => '(UTC+01:00) West Central Africa',
+    'Europe/Zagreb'                    => '(UTC+01:00) Zagreb',
+    'Europe/Athens'                    => '(UTC+02:00) Athens',
+    'Europe/Bucharest'                 => '(UTC+02:00) Bucharest',
+    'Africa/Cairo'                     => '(UTC+02:00) Cairo',
+    'Africa/Harare'                    => '(UTC+02:00) Harare',
+    'Europe/Helsinki'                  => '(UTC+02:00) Helsinki',
+    'Europe/Istanbul'                  => '(UTC+02:00) Istanbul',
+    'Asia/Jerusalem'                   => '(UTC+02:00) Jerusalem',
+    'Africa/Johannesburg'              => '(UTC+02:00) Pretoria',
+    'Europe/Riga'                      => '(UTC+02:00) Riga',
+    'Europe/Sofia'                     => '(UTC+02:00) Sofia',
+    'Europe/Tallinn'                   => '(UTC+02:00) Tallinn',
+    'Europe/Vilnius'                   => '(UTC+02:00) Vilnius',
+    'Asia/Baghdad'                     => '(UTC+03:00) Baghdad',
+    'Asia/Kuwait'                      => '(UTC+03:00) Kuwait',
+    'Europe/Minsk'                     => '(UTC+03:00) Minsk',
+    'Africa/Nairobi'                   => '(UTC+03:00) Nairobi',
+    'Asia/Riyadh'                      => '(UTC+03:00) Riyadh',
+    'Europe/Volgograd'                 => '(UTC+03:00) Volgograd',
+    'Asia/Tehran'                      => '(UTC+03:30) Tehran',
+    'Asia/Baku'                        => '(UTC+04:00) Baku',
+    'Europe/Moscow'                    => '(UTC+04:00) Moscow',
+    'Asia/Muscat'                      => '(UTC+04:00) Muscat',
+    'Asia/Tbilisi'                     => '(UTC+04:00) Tbilisi',
+    'Asia/Yerevan'                     => '(UTC+04:00) Yerevan',
+    'Asia/Kabul'                       => '(UTC+04:30) Kabul',
+    'Asia/Karachi'                     => '(UTC+05:00) Karachi',
+    'Asia/Tashkent'                    => '(UTC+05:00) Tashkent',
+    'Asia/Calcutta'                    => '(UTC+05:30) Chennai',
+    'Asia/Kolkata'                     => '(UTC+05:30) Kolkata',
+    'Asia/Katmandu'                    => '(UTC+05:45) Kathmandu',
+    'Asia/Almaty'                      => '(UTC+06:00) Almaty',
+    'Asia/Dhaka'                       => '(UTC+06:00) Dhaka',
+    'Asia/Yekaterinburg'               => '(UTC+06:00) Ekaterinburg',
+    'Asia/Rangoon'                     => '(UTC+06:30) Rangoon',
+    'Asia/Bangkok'                     => '(UTC+07:00) Bangkok',
+    'Asia/Jakarta'                     => '(UTC+07:00) Jakarta',
+    'Asia/Novosibirsk'                 => '(UTC+07:00) Novosibirsk',
+    'Asia/Chongqing'                   => '(UTC+08:00) Chongqing',
+    'Asia/Shanghai'                    => '(UTC+08:00) Shanghai',
+    'Asia/Hong_Kong'                   => '(UTC+08:00) Hong Kong',
+    'Asia/Krasnoyarsk'                 => '(UTC+08:00) Krasnoyarsk',
+    'Asia/Kuala_Lumpur'                => '(UTC+08:00) Kuala Lumpur',
+    'Australia/Perth'                  => '(UTC+08:00) Perth',
+    'Asia/Singapore'                   => '(UTC+08:00) Singapore',
+    'Asia/Taipei'                      => '(UTC+08:00) Taipei',
+    'Asia/Ulan_Bator'                  => '(UTC+08:00) Ulaan Bataar',
+    'Asia/Urumqi'                      => '(UTC+08:00) Urumqi',
+    'Asia/Irkutsk'                     => '(UTC+09:00) Irkutsk',
+    'Asia/Seoul'                       => '(UTC+09:00) Seoul',
+    'Asia/Tokyo'                       => '(UTC+09:00) Tokyo',
+    'Australia/Adelaide'               => '(UTC+09:30) Adelaide',
+    'Australia/Darwin'                 => '(UTC+09:30) Darwin',
+    'Australia/Brisbane'               => '(UTC+10:00) Brisbane',
+    'Australia/Canberra'               => '(UTC+10:00) Canberra',
+    'Pacific/Guam'                     => '(UTC+10:00) Guam',
+    'Australia/Hobart'                 => '(UTC+10:00) Hobart',
+    'Australia/Melbourne'              => '(UTC+10:00) Melbourne',
+    'Pacific/Port_Moresby'             => '(UTC+10:00) Port Moresby',
+    'Australia/Sydney'                 => '(UTC+10:00) Sydney',
+    'Asia/Yakutsk'                     => '(UTC+10:00) Yakutsk',
+    'Asia/Vladivostok'                 => '(UTC+11:00) Vladivostok',
+    'Pacific/Auckland'                 => '(UTC+12:00) Auckland',
+    'Pacific/Fiji'                     => '(UTC+12:00) Fiji',
+    'Pacific/Kwajalein'                => '(UTC+12:00) International Date Line West',
+    'Asia/Kamchatka'                   => '(UTC+12:00) Kamchatka',
+    'Asia/Magadan'                     => '(UTC+12:00) Magadan',
+    'Pacific/Tongatapu'                => '(UTC+13:00) Nuku\'alofa'
+);
diff --git a/module/common/model.php b/module/common/model.php
index 43ea854d5e..c47a1a0c94 100644
--- a/module/common/model.php
+++ b/module/common/model.php
@@ -27,6 +27,7 @@ class commonModel extends model
             $this->setCompany();
             $this->setUser();
             $this->loadConfigFromDB();
+            $this->app->setTimezone();
             if((strpos($this->config->global->version, 'pro') !== false && version_compare($this->config->global->version, 'pro2.3.beta', '>'))
                 || (strpos($this->config->global->version, 'biz') !== false)
                 || version_compare($this->config->global->version, '4.3.beta', '>'))
diff --git a/module/custom/control.php b/module/custom/control.php
index ad34dac1e8..4d0680144f 100644
--- a/module/custom/control.php
+++ b/module/custom/control.php
@@ -318,6 +318,25 @@ class custom extends control
         $this->display();
     }
 
+    /**
+     * Timezone.
+     * 
+     * @access public
+     * @return void
+     */
+    public function timezone()
+    {
+        if(strtolower($_SERVER['REQUEST_METHOD']) == "post")
+        {
+            $this->loadModel('setting')->setItems('system.common', fixer::input('post')->get());
+            $this->send(array('result' => 'success', 'message' => $this->lang->saveSuccess, 'locate' => 'reload'));
+        }
+
+        $this->view->title = $this->lang->custom->timezone;
+        $this->view->position[] = $this->lang->custom->timezone;
+        $this->display();
+    }
+
     /**
      * Ajax save custom fields.
      * 
diff --git a/module/custom/lang/en.php b/module/custom/lang/en.php
index b82a96bed9..d83a4fca8e 100644
--- a/module/custom/lang/en.php
+++ b/module/custom/lang/en.php
@@ -16,6 +16,7 @@ $lang->custom->lang       = 'Language';
 $lang->custom->setPublic  = 'Set Public';
 $lang->custom->required   = 'Required';
 $lang->custom->score      = 'Point';
+$lang->custom->timezone   = 'Timezone';
 $lang->custom->scoreReset = 'Reset Point';
 
 $lang->custom->object['story']    = 'Story';
diff --git a/module/custom/lang/zh-cn.php b/module/custom/lang/zh-cn.php
index aa87bf6d01..98b09eedd9 100644
--- a/module/custom/lang/zh-cn.php
+++ b/module/custom/lang/zh-cn.php
@@ -16,6 +16,7 @@ $lang->custom->lang       = '所属语言';
 $lang->custom->setPublic  = '设为公共';
 $lang->custom->required   = '必填项';
 $lang->custom->score      = '积分';
+$lang->custom->timezone   = '时区';
 $lang->custom->scoreReset = '重置积分';
 
 $lang->custom->object['story']    = '需求';
diff --git a/module/custom/view/header.html.php b/module/custom/view/header.html.php
index 25442e6a55..67316c32a4 100644
--- a/module/custom/view/header.html.php
+++ b/module/custom/view/header.html.php
@@ -6,6 +6,7 @@
   {
       common::printLink('custom', 'set', "module=$object", "<span class='text'>{$name}</span>", '', "class='btn btn-link' id='{$object}Tab'"); 
   }
+  common::printLink('custom', 'timezone', "", "<span class='text'>{$lang->custom->timezone}</span>", '', "class='btn btn-link' id='timezoneTab'"); 
   common::printLink('custom', 'flow', "", "<span class='text'>{$lang->custom->flow}</span>", '', "class='btn btn-link' id='flowTab'"); 
   common::printLink('custom', 'working', '', "<span class='text'>{$lang->custom->working}</span>", '', "class='btn btn-link' id='workingTab'"); 
   common::printLink('custom', 'required', '', "<span class='text'>{$lang->custom->required}</span>", '', "class='btn btn-link' id='requiredTab'");
diff --git a/module/custom/view/timezone.html.php b/module/custom/view/timezone.html.php
new file mode 100644
index 0000000000..703981133c
--- /dev/null
+++ b/module/custom/view/timezone.html.php
@@ -0,0 +1,41 @@
+<?php
+/**
+ * The timezone view file of custom module of ZenTaoPMS.
+ *
+ * @copyright   Copyright 2009-2015 青岛易软天创网络科技有限公司(QingDao Nature Easy Soft Network Technology Co,LTD, www.cnezsoft.com)
+ * @license     ZPL (http://zpl.pub/page/zplv12.html)
+ * @author      Yidong Wang <yidong@cnezsoft.com>
+ * @package     custom
+ * @version     $Id$
+ * @link        http://www.zentao.net
+ */
+?>
+<?php include 'header.html.php';?>
+<?php include $this->app->getConfigRoot() . 'timezones.php';?>
+<div id='mainContent' class='main-content'>
+  <form class="load-indicator main-form form-ajax" method='post'>
+    <div class='main-header'>
+      <div class='heading'>
+        <strong><?php echo $lang->custom->timezone?></strong>
+      </div>
+    </div>
+    <table class='table table-form'>
+      <tr>
+        <th class='w-200px'><?php echo $lang->custom->timezone;?></th>
+        <td><?php echo html::select('timezone', $timezoneList, $config->timezone, "class='form-control chosen'");?></td>
+      </tr>
+      <tr>
+        <th></th>
+        <td class='form-actions'><?php echo html::submitButton();?></td>
+      </tr>
+    </table>
+  </form>
+</div>
+<script>
+$(function()
+{
+    $('#mainMenu #timezoneTab').addClass('btn-active-text');
+})
+</script>
+<?php include '../../common/view/footer.html.php';?>
+
diff --git a/module/install/lang/en.php b/module/install/lang/en.php
index 1b0ba92f96..3817747cd8 100644
--- a/module/install/lang/en.php
+++ b/module/install/lang/en.php
@@ -88,6 +88,7 @@ $lang->install->chmodWin     = ' "%s" privilege has to be changed.';
 $lang->install->mkdirLinux   = '<p>%s directory has to be created.<br /> Run <code>mkdir -p %s</code> to create it.</p>';
 $lang->install->chmodLinux   = ' "%s" privilege has to be changed.<br /> Run <code>chmod o=rwx -R %s</code> to change it.';
 
+$lang->install->timezone       = 'Set Timezone';
 $lang->install->defaultLang    = 'Default Language';
 $lang->install->dbHost         = 'Database Host';
 $lang->install->dbHostNote     = 'If 127.0.0.1 is not accessible, try localhost.';
diff --git a/module/install/lang/zh-cn.php b/module/install/lang/zh-cn.php
index 2d376227d0..893a92576c 100644
--- a/module/install/lang/zh-cn.php
+++ b/module/install/lang/zh-cn.php
@@ -88,6 +88,7 @@ $lang->install->chmodWin     = '需要修改目录 "%s" 的权限。';
 $lang->install->mkdirLinux   = '<p>需要创建目录%s。<br /> 命令为：<br /> mkdir -p %s</p>';
 $lang->install->chmodLinux   = '需要修改目录 "%s" 的权限。<br />命令为：<br />chmod o=rwx -R %s';
 
+$lang->install->timezone       = '时区设置';
 $lang->install->defaultLang    = '默认语言';
 $lang->install->dbHost         = '数据库服务器';
 $lang->install->dbHostNote     = '如果127.0.0.1无法访问，尝试使用localhost';
diff --git a/module/install/view/step2.html.php b/module/install/view/step2.html.php
index a2b2431126..c050bb1778 100644
--- a/module/install/view/step2.html.php
+++ b/module/install/view/step2.html.php
@@ -22,6 +22,11 @@
               <th colspan='2'><?php echo $lang->install->value?></th>
             </tr>
           </thead>
+          <tr>
+            <?php include $this->app->getConfigRoot() . 'timezones.php';?>
+            <th><?php echo $lang->install->timezone;?></th>
+            <td><?php echo html::select('timezone', $timezoneList, $config->timezone, "class='form-control'");?></td><td></td>
+          </tr>
           <tr>
             <th><?php echo $lang->install->defaultLang;?></th>
             <td><?php echo html::select('defaultLang', $config->langs, $app->getClientLang(), "class='form-control'");?></td><td></td>
diff --git a/module/install/view/step3.html.php b/module/install/view/step3.html.php
index 7ff5bb471c..89130bb7e4 100644
--- a/module/install/view/step3.html.php
+++ b/module/install/view/step3.html.php
@@ -18,6 +18,7 @@ if(!isset($error))
 \$config->installed       = true;
 \$config->debug           = false;
 \$config->requestType     = '$requestType';
+\$config->timezone        = '$timezone';
 \$config->db->host        = '$dbHost';
 \$config->db->port        = '$dbPort';
 \$config->db->name        = '$dbName';