diff --git a/TODO b/TODO
index 265c70b..8c0a114 100755
--- a/TODO
+++ b/TODO
@@ -9,3 +9,20 @@ install.php :
 =============
 * Link beside password field to toggle visible / not visible
 * TRUNCATE before CREATE TABLE in install.php
+
+inc/Invoices.class.php :
+========================
+* Better way to store date ? (use specific date types)
+* Better way to store users in ?
+* Modify load() method to handle complex queries (such as WHERE date < DATE_1 AND date > DATE_2)
+
+index.php?do=new_invoice :
+==========================
+* Improve date handling for form display
+
+index.php?do=settings :
+=======================
+* Prefill the timezone field
+* Fill the fields with POST
+* Handle checkboxes in PHP ?
+* JavaScript to handle singular / plural + months
diff --git a/inc/Invoices.class.php b/inc/Invoices.class.php
index e69de29..45e9eb5 100644
--- a/inc/Invoices.class.php
+++ b/inc/Invoices.class.php
@@ -0,0 +1,83 @@
+<?php
+    require_once('data/config.php');
+    require_once('Storage.class.php');
+
+    class Invoices extends Storage {
+        protected $id, $date, $users_in, $buyer, $amount, $what;
+        protected $TABLE_NAME = "Invoices";
+        protected $fields = array(
+            'id'=>'key',
+            'date'=>'int',
+            'users_in'=>'string',
+            'buyer'=>'int',
+            'amount'=>'float',
+            'what'=>'text'
+            );
+
+        public function getId() {
+            return $this->id;
+        }
+
+        public function getDate() {
+            return $this->date;
+        }
+
+        public function getUsersIn() {
+            return $this->users_in;
+        }
+
+        public function getBuyer() {
+            return $this->buyer;
+        }
+
+        public function getAmount() {
+            return $this->amount;
+        }
+
+        public function getWhat() {
+            return $this->what;
+        }
+
+        public function setId($id) {
+            $this->id = (int) $id;
+        }
+
+        public function setDate($date) {
+            $this->date = $date;
+        }
+
+        public function setUsersIn($users_in) {
+            $this->users_in = $users_in;
+        }
+
+        public function setBuyer($buyer) {
+            $this->buyer = (int) $buyer;
+        }
+
+        public function setAmount ($admount) {
+            $this->amount = (float) $amount;
+        }
+
+        public function setWhat($what) {
+            $this->what = $what;
+        }
+
+
+        public function load_invoices($fields = NULL) {
+            $return = array();
+            $invoices = $this->load($fields);
+
+            foreach($invoices as $invoice) {
+                $return[$invoice['id']] = new Invoice();
+
+                $return[$invoice['id']]->setId($invoice['id']);
+                $return[$invoice['id']]->setDate($invoice['date']);
+                $return[$invoice['id']]->setUsersIn($invoice['users_in']);
+                $return[$invoice['id']]->setBuyer($invoice['buyer']);
+                $return[$invoice['id']]->setAmount($invoice['amount']);
+                $return[$invoice['id']]->setWhat($invoice['what']);
+            }
+
+            return $return;
+        }
+    }
diff --git a/inc/Storage.class.php b/inc/Storage.class.php
index ae5e598..0865e92 100644
--- a/inc/Storage.class.php
+++ b/inc/Storage.class.php
@@ -59,6 +59,7 @@ class Storage {
         $return = false;
         switch($type) {
             case 'key':
+            case 'int':
                 $return = 'INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY'; 
                 break;
 
@@ -74,6 +75,7 @@ class Storage {
                 $return = 'VARCHAR(130)';
                 break;
 
+            case 'text':
             default:
                 $return = 'TEXT CHARACTER SET utf8 COLLATE utf8_general_ci';
                 break;
diff --git a/inc/User.class.php b/inc/User.class.php
index 6ae8964..b587b36 100644
--- a/inc/User.class.php
+++ b/inc/User.class.php
@@ -93,9 +93,9 @@ class User extends Storage {
         $this->setAdmin($user_data['admin']);
     }
 
-    public function load_users() {
+    public function load_users($fields = NULL) {
         $return = array();
-        $users = $this->load();
+        $users = $this->load($fields);
 
         foreach($users as $user) {
             $return[$user['id']] = new User();
diff --git a/index.php b/index.php
index b75794e..175bf28 100644
--- a/index.php
+++ b/index.php
@@ -3,6 +3,7 @@
     if(!file_exists('data/config.php')) header('location: install.php');
     require_once('data/config.php');
     require_once('inc/User.class.php');
+    require_once('inc/Invoices.class.php');
     require_once('inc/rain.tpl.class.php');
     require_once('inc/functions.php');
     raintpl::$tpl_dir = 'tpl/';
@@ -156,7 +157,7 @@
             break;
 
         case 'settings':
-            if(!empty($_POST['mysql_host']) && !empty($_POST['mysql_login']) && !empty($_POST['mysql_db']) && !empty($_POST['currency']) && !empty($_POST['instance_title']) && !empty($_POST['base_url'])) {
+            if(!empty($_POST['mysql_host']) && !empty($_POST['mysql_login']) && !empty($_POST['mysql_db']) && !empty($_POST['currency']) && !empty($_POST['instance_title']) && !empty($_POST['base_url']) && !empty($_POST['timezone'])) {
                 if(!is_writable('data/')) {
                     $tpl>assign('error', 'The script can\'t write in data/ dir, check permissions set on this folder.');
                 }
@@ -179,6 +180,8 @@
                         $config[$line_number] = "\tdefine('".$_POST['base_url']."');\n";
                     elseif(strpos($line, "CURRENCY") !== FALSE)
                         $config[$line_number] = "\tdefine('".$_POST['currency']."');\n";
+                    elseif(strpos($line_number, 'date_default_timezone_set') !== FALSE)
+                        $config[$line_number] = "\tdate_default_timezone_set('".$_POST['timezone']."');\n";
                 }
 
                 if(file_put_contents("data/config.php", $config)) {
@@ -194,15 +197,53 @@
             $tpl->assign('mysql_login', MYSQL_LOGIN);
             $tpl->assign('mysql_db', MYSQL_DB);
             $tpl->assign('mysql_prefix', MYSQL_PREFIX);
+            $tpl->assign('timezone', '');
             $tpl->assign('show_settings', true);
             $tpl->draw('settings');
             break;
 
+        case 'new_invoice':
+            if(!empty($_POST['what']) && (float) $_POST['amount'] != 0 && !empty($_POST['date_day']) && !empty($_POT['date_month']) && !empty($_POST['date_year']) && !empty($_POST['users_in'])) {
+                $invoice = new Invoice();
+                $invoice->setWhat($_POST['what']);
+                $invoice->setAmount($_POST['amount']);
+                $invoice->setBuyer($current_user->getId());
+                $invoice->setDate();
+
+                //TODO : Handle users_in + guests
+
+                $invoice->save();
+                header('location: index.php');
+                exit();
+            }
+
+            $users_list = new User();
+            $users_list = $users_list->load_users();
+
+            $tpl->assign('days', range(1,31)); // TODO : Improve it
+            $tpl->assign('months', range(1, 12));
+            $tpl->assign('years', range(date('Y') - 1, date('Y') + 1));
+
+            $tpl->assign('day_post', (!empty($_POST['date_day']) ? (int) $_POST['date_day'] : (int) date('d')));
+            $tpl->assign('month_post', (!empty($_POST['date_month']) ? (int) $_POST['date_month'] : (int) date('m')));
+            $tpl->assign('year_post', (!empty($_POST['date_year']) ? (int) $_POST['date_year'] : (int) date('Y')));
+
+            $tpl->assign('amount_post', (!empty($_POST['amount']) ? (float) $_POST['amount'] : 0));
+            $tpl->assign('what_post', (!empty($_POST['what']) ? htmlspecialchars($_POST['what']) : ''));
+            $tpl->assign('users', $users_list);
+            $tpl->draw('new_invoice');
+            break;
+
         default:
             $users_list = new User();
             $users_list = $users_list->load_users();
+
+            $invoices_list = new Invoices();
+            $invoices_list = $invoices_list->load_invoices();
+
             $tpl->assign('users', $users_list);
-            $tpl->assign('bill', array(0=>array()));
+            $tpl->assign('invoices', $invoices_list);
+
             $tpl->draw('index');
             break;
     }
diff --git a/install.php b/install.php
index 0d7afae..e0ecfba 100644
--- a/install.php
+++ b/install.php
@@ -11,7 +11,7 @@
         $block_form = true;
     }
 
-    if(!empty($_POST['mysql_host']) && !empty($_POST['mysql_login']) && !empty($_POST['mysql_db']) && !empty($_POST['admin_login']) && !empty($_POST['admin_password']) && !empty($_POST['currency']) && !empty($_POST['instance_title']) && !empty($_POST['base_url'])) {
+    if(!empty($_POST['mysql_host']) && !empty($_POST['mysql_login']) && !empty($_POST['mysql_db']) && !empty($_POST['admin_login']) && !empty($_POST['admin_password']) && !empty($_POST['currency']) && !empty($_POST['instance_title']) && !empty($_POST['base_url']) && !empty($_POST['timezone'])) {
         $mysql_host = $_POST['mysql_host'];
         $mysql_login = $_POST['mysql_login'];
         $mysql_db = $_POST['mysql_db'];
@@ -23,9 +23,10 @@
             $db = new PDO('mysql:host='.$mysql_host.';dbname='.$mysql_db, $mysql_login, $mysql_password);
 
             //Create table "Users"
-            $dump = $db->query('CREATE TABLE IF NOT EXISTS '.$mysql_prefix.'Users (id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY, login VARCHAR(255), display_name VARCHAR(255), password VARCHAR(130), admin TINYINT(1)) DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci');
+            $db->query('CREATE TABLE IF NOT EXISTS '.$mysql_prefix.'Users (id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY, login VARCHAR(255), display_name VARCHAR(255), password VARCHAR(130), admin TINYINT(1)) DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci');
  
-            //Create table "Invoices" - TODO
+            //Create table "Invoices"
+            $db->query('CREATE TABLE IF NOT EXISTS '.$mysql_prefix.'Invoices (id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY, date INT(11), users_in VARCHAR(255), buyer INT(11), amount FLOAT, what TEXT) DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci');
             //Create table "Payback" - TODO
         } catch (PDOException $e) {
             $error = 'Unable to connect to database, check your credentials and config.<br/>Error message : '.$e->getMessage().'.';
@@ -51,7 +52,10 @@
     define('INSTANCE_TITLE', '".$instance_title."');
     define('BASE_URL', '".$_POST['base_url']."');
     define('SALT', '".$salt."');
-    define('CURRENCY', '".$_POST['currency']."');";
+    define('CURRENCY', '".$_POST['currency']."');
+    
+    date_default_timezone_set('".$_POST['timezone']."');
+    ";
 
             if(file_put_contents("data/config.php", $config) && file_put_contents("data/notice", '')) {
                 try {
@@ -113,6 +117,10 @@
                     <em>Note :</em> This is the base URL from which you access this page. You must keep the trailing "/" in the above address.
                 </p>
                 <p><label for="currency">Currency : </label><input type="text" name="currency" id="currency" size="3"/></p>
+                <p>
+                    <label for="timezone">Timezone : </label><input type="text" name="timezone" id="timezone" value="<?php echo @date_default_timezone_get();?>"/><br/>
+                    <em>For example :</em> Europe/Paris. See the doc for more info.
+                </p>
             </fieldset>
             <fieldset>
                 <legend>Administrator</legend>
diff --git a/tmp/header.36ba0f7e771a8681573a91518b54b424.rtpl.php b/tmp/header.36ba0f7e771a8681573a91518b54b424.rtpl.php
index 1f64560..3fbcaee 100755
--- a/tmp/header.36ba0f7e771a8681573a91518b54b424.rtpl.php
+++ b/tmp/header.36ba0f7e771a8681573a91518b54b424.rtpl.php
@@ -1,10 +1,11 @@
 <?php if(!class_exists('raintpl')){exit;}?><!DOCTYPE html>
 <html lang="fr">
 <head>
-<meta charset="utf-8">
-<title><?php echo $instance_title;?></title>
-<link rel="stylesheet" media="screen" type="text/css" href="tpl/./css/style.css" />
-<link rel="icon" href="tpl/./favicon.ico" />
+    <meta charset="utf-8">
+    <title><?php echo $instance_title;?></title>
+    <link rel="stylesheet" media="screen" type="text/css" href="tpl/./css/style.css" />
+    <link rel="icon" href="tpl/./favicon.ico" />
+    <script type="text/javascript" src="tpl/./js/main.js"></script>
 </head>
 <body>
 <?php if( !$connection ){ ?>
diff --git a/tmp/index.af3906cfde643ae7f290cfdc51cc9342.rtpl.php b/tmp/index.af3906cfde643ae7f290cfdc51cc9342.rtpl.php
index 9707ece..b8af817 100755
--- a/tmp/index.af3906cfde643ae7f290cfdc51cc9342.rtpl.php
+++ b/tmp/index.af3906cfde643ae7f290cfdc51cc9342.rtpl.php
@@ -41,16 +41,16 @@
             <th>Edit</th>
             <th>Delete</th>
         </tr>
-        <?php $counter1=-1; if( isset($bill) && is_array($bill) && sizeof($bill) ) foreach( $bill as $key1 => $value1 ){ $counter1++; ?>
+        <?php $counter1=-1; if( isset($invoices) && is_array($invoices) && sizeof($invoices) ) foreach( $invoices as $key1 => $value1 ){ $counter1++; ?>
 
             <tr>
-                <td><?php echo $value1["date"];?></td>
-                <td><?php echo $value1["buyer"];?></td>
-                <td><?php echo $value1["users_in"];?></td>
-                <td><?php echo $value1["amount"];?></td>
-                <td><?php echo $value1["what"];?></td>
-                <td><a href="index.php?do=edit_bill&id=">Edit</a></td>
-                <td><a href="index.php?do=delete_bill&id=">Delete</a></td>
+                <td><?php echo $value1->getDate;?></td>
+                <td><?php echo $value1->getBuyer;?></td>
+                <td><?php echo $value1->getUsersIn;?></td>
+                <td><?php echo $value1->getAmount;?></td>
+                <td><?php echo $value1->getWhat;?></td>
+                <td><a href="index.php?do=edit_bill&id=<?php echo $value1->getId();?>">Edit</a></td>
+                <td><a href="index.php?do=delete_bill&id=<?php echo $value1->getId();?>">Delete</a></td>
             </tr>
         <?php } ?>
 
diff --git a/tmp/new_invoice.af3906cfde643ae7f290cfdc51cc9342.rtpl.php b/tmp/new_invoice.af3906cfde643ae7f290cfdc51cc9342.rtpl.php
new file mode 100644
index 0000000..b289f93
--- /dev/null
+++ b/tmp/new_invoice.af3906cfde643ae7f290cfdc51cc9342.rtpl.php
@@ -0,0 +1,54 @@
+<?php if(!class_exists('raintpl')){exit;}?><?php $tpl = new RainTPL;$tpl_dir_temp = self::$tpl_dir;$tpl->assign( $this->var );$tpl->draw( dirname("header") . ( substr("header",-1,1) != "/" ? "/" : "" ) . basename("header") );?>
+
+
+<h2>Add a bill</h2>
+
+<form method="post" action="index.php?do=new_invoice" id="invoice_form">
+    <p>
+        <label for="what">What ? </label>
+    </p>
+    <textarea name="what" id="what" rows="10"><?php echo $what_post;?></textarea>
+    <p>
+        <label for="amount">Amount : </label>
+        <input type="text" name="amount" id="amount" {($amount_post != 0) ? 'value="'.$value_post.'"' : ''} size="5"/> <?php echo $currency;?>
+
+    </p>
+    <p>
+        <label for="date_day">Date : </label>
+        <select name="date_day" id="date_day">
+            <?php $counter1=-1; if( isset($days) && is_array($days) && sizeof($days) ) foreach( $days as $key1 => $value1 ){ $counter1++; ?>
+
+            <option value="<?php echo $value1;?>" <?php if( $value1 == $day_post ){ ?>selected<?php } ?>><?php echo $value1;?></option>
+            <?php } ?>
+
+        </select> / 
+        <select name="date_month">
+            <?php $counter1=-1; if( isset($months) && is_array($months) && sizeof($months) ) foreach( $months as $key1 => $value1 ){ $counter1++; ?>
+
+                <option value="<?php echo $value1;?>" <?php if( $value1 == $month_post ){ ?>selected<?php } ?> onchange="set_days_month_year();"><?php echo $value1;?></option>
+            <?php } ?>
+
+        </select> / 
+        <select name="date_year">
+            <?php $counter1=-1; if( isset($years) && is_array($years) && sizeof($years) ) foreach( $years as $key1 => $value1 ){ $counter1++; ?>
+
+                <option value="<?php echo $value1;?>" <?php if( $value1 == $year_post ){ ?>selected<?php } ?> onchange="set_days_month_year();"><?php echo $value1;?></option>
+            <?php } ?>
+
+        </select>
+    </p>
+    <p>
+        Users in ?
+        <?php $counter1=-1; if( isset($users) && is_array($users) && sizeof($users) ) foreach( $users as $key1 => $value1 ){ $counter1++; ?>
+
+            <br/><input type="checkbox" name="users_in" value="<?php echo $value1->getId();?>" id="users_in_<?php echo $value1->getId();?>"/> <label for="users_in_<?php echo $value1->getId();?>"><?php echo $value1->getDisplayName();?></label> and <input type="text" name="guest_user_<?php echo $value1->getId();?>" id="guest_user_<?php echo $value1->getId();?>" size="1" value="0"/><label for="guest_user_<?php echo $value1->getId();?>"> guest</label>.
+        <?php } ?>
+
+    </p>
+    <p>
+        <input type="submit" value="Add"/>
+    </p>
+</form>
+
+<?php $tpl = new RainTPL;$tpl_dir_temp = self::$tpl_dir;$tpl->assign( $this->var );$tpl->draw( dirname("footer") . ( substr("footer",-1,1) != "/" ? "/" : "" ) . basename("footer") );?>
+
diff --git a/tpl/css/style.css b/tpl/css/style.css
index a4c26cd..25f4227 100644
--- a/tpl/css/style.css
+++ b/tpl/css/style.css
@@ -83,7 +83,7 @@ input[type=submit] {
     text-align: center
 }
 
-#edit_password_form, #edit_user_form {
+#edit_password_form, #edit_user_form, #invoice_form {
     width: 50%;
     margin-left: 15%;
 }
@@ -96,6 +96,10 @@ input[type=submit] {
     width: 50%;
 }
 
+textarea#what {
+    width: 75%;
+}
+
 #install {
     margin: 0;
 }
diff --git a/tpl/header.html b/tpl/header.html
index 6b378df..722ad33 100755
--- a/tpl/header.html
+++ b/tpl/header.html
@@ -1,10 +1,11 @@
 <!DOCTYPE html>
 <html lang="fr">
 <head>
-<meta charset="utf-8">
-<title>{$instance_title}</title>
-<link rel="stylesheet" media="screen" type="text/css" href="css/style.css" />
-<link rel="icon" href="favicon.ico" />
+    <meta charset="utf-8">
+    <title>{$instance_title}</title>
+    <link rel="stylesheet" media="screen" type="text/css" href="css/style.css" />
+    <link rel="icon" href="favicon.ico" />
+    <script type="text/javascript" src="js/main.js"></script>
 </head>
 <body>
 {if condition="!$connection"}
diff --git a/tpl/index.html b/tpl/index.html
index 3ebf314..5baee74 100755
--- a/tpl/index.html
+++ b/tpl/index.html
@@ -34,15 +34,15 @@
             <th>Edit</th>
             <th>Delete</th>
         </tr>
-        {loop="bill"}
+        {loop="invoices"}
             <tr>
-                <td>{$value.date}</td>
-                <td>{$value.buyer}</td>
-                <td>{$value.users_in}</td>
-                <td>{$value.amount}</td>
-                <td>{$value.what}</td>
-                <td><a href="index.php?do=edit_bill&id=">Edit</a></td>
-                <td><a href="index.php?do=delete_bill&id=">Delete</a></td>
+                <td>{$value->getDate}</td>
+                <td>{$value->getBuyer}</td>
+                <td>{$value->getUsersIn}</td>
+                <td>{$value->getAmount}</td>
+                <td>{$value->getWhat}</td>
+                <td><a href="index.php?do=edit_bill&id={$value->getId()}">Edit</a></td>
+                <td><a href="index.php?do=delete_bill&id={$value->getId()}">Delete</a></td>
             </tr>
         {/loop}
     </table>
diff --git a/tpl/js/main.js b/tpl/js/main.js
new file mode 100644
index 0000000..4e44235
--- /dev/null
+++ b/tpl/js/main.js
@@ -0,0 +1,3 @@
+function set_days_month_year() {
+    
+}
diff --git a/tpl/new_invoice.html b/tpl/new_invoice.html
new file mode 100755
index 0000000..58123dd
--- /dev/null
+++ b/tpl/new_invoice.html
@@ -0,0 +1,43 @@
+{include="header"}
+
+<h2>Add a bill</h2>
+
+<form method="post" action="index.php?do=new_invoice" id="invoice_form">
+    <p>
+        <label for="what">What ? </label>
+    </p>
+    <textarea name="what" id="what" rows="10">{$what_post}</textarea>
+    <p>
+        <label for="amount">Amount : </label>
+        <input type="text" name="amount" id="amount" {($amount_post != 0) ? 'value="'.$value_post.'"' : ''} size="5"/> {$currency}
+    </p>
+    <p>
+        <label for="date_day">Date : </label>
+        <select name="date_day" id="date_day">
+            {loop="days"}
+            <option value="{$value}" {if condition="$value == $day_post"}selected{/if}>{$value}</option>
+            {/loop}
+        </select> / 
+        <select name="date_month">
+            {loop="months"}
+                <option value="{$value}" {if condition="$value == $month_post"}selected{/if} onchange="set_days_month_year();">{$value}</option>
+            {/loop}
+        </select> / 
+        <select name="date_year">
+            {loop="years"}
+                <option value="{$value}" {if condition="$value == $year_post"}selected{/if} onchange="set_days_month_year();">{$value}</option>
+            {/loop}
+        </select>
+    </p>
+    <p>
+        Users in ?
+        {loop="users"}
+            <br/><input type="checkbox" name="users_in" value="{$value->getId()}" id="users_in_{$value->getId()}"/> <label for="users_in_{$value->getId()}">{$value->getDisplayName()}</label> and <input type="text" name="guest_user_{$value->getId()}" id="guest_user_{$value->getId()}" size="1" value="0"/><label for="guest_user_{$value->getId()}"> guest</label>.
+        {/loop}
+    </p>
+    <p>
+        <input type="submit" value="Add"/>
+    </p>
+</form>
+
+{include="footer"}
diff --git a/tpl/settings.html b/tpl/settings.html
index 67d8ff9..d5f2e3a 100644
--- a/tpl/settings.html
+++ b/tpl/settings.html
@@ -41,6 +41,10 @@
             <em>Note :</em> This is the base URL from which you access this page. You must keep the trailing "/" in the above address.
         </p>
         <p><label for="currency">Currency : </label><input type="text" name="currency" id="currency" size="3" value="{$currency}"/></p>
+        <p>
+            <label for="timezone">Timezone : </label><input type="text" name="timezone" id="timezone" value="{$timezone}"/><br/>
+            <em>For example :</em> Europe/Paris. See the doc for more info.
+        </p>
     </fieldset>
     <p class="center"><input type="submit" value="Update settings"></p>
 </form>