diff --git a/class_management.php b/class_management.php
index 13c534c..172a8b8 100755
--- a/class_management.php
+++ b/class_management.php
@@ -98,6 +98,7 @@ class PhpObject
 	
 	function __construct($sClass='', $bDebug=false, $iExtractMode=self::MODE_FILE)
 	{
+		$this->asMessageStack = array();
 		$this->resetMessageStack();
 		$this->setDebug($bDebug);
 		$this->setExtractMode($iExtractMode);
diff --git a/inc/db.php b/inc/db.php
index 449a701..7a795c3 100644
--- a/inc/db.php
+++ b/inc/db.php
@@ -37,14 +37,14 @@ class Db extends PhpObject
 	 * 			'cascading_delete'=>array('table_name1'=>array('linked_table1', 'linked_table2', ...), 'table_name2'=>...))
 	 * @var Array
 	 */
-	public function __construct($sDbServer, $sLogin, $sPass, $sDatabase, $asOptions, $sEncoding='utf8mb4', $sTimeZone='Europe/Paris')
+	public function __construct($sDbServer, $sLogin, $sPass, $sDatabase, $asOptions, $sEncoding='utf8mb4')
 	{
 		parent::__construct(__FILE__, Settings::DEBUG);
 		$this->sDatabase = $sDatabase;
 		$this->asOptions = $asOptions;
 		//$this->oConnection = mysql_connect(self::DB_SERVER, self::DB_LOGIN, self::DB_PASS);
 		$this->oConnection = new mysqli($sDbServer, $sLogin, $sPass);
-		$this->syncPhpParams($sEncoding, $sTimeZone);
+		$this->syncPhpParams($sEncoding);
 
 		/*
 		 $dsn = 'mysql:dbname='.$this->sDatabase.';host='.self::DB_SERVER;
@@ -73,13 +73,13 @@ class Db extends PhpObject
 		}
 	}
 
-	private function syncPhpParams($sEncoding, $sTimeZone)
+	private function syncPhpParams($sEncoding)
 	{
 		//Characters encoding
 		$this->oConnection->set_charset($sEncoding); //SET NAMES
 
 		//Timezone
-		$this->setQuery("SET time_zone='{$sTimeZone}';");
+		$this->setQuery("SET time_zone='".date_default_timezone_get()."';");
 	}
 
 	public function __destruct()
@@ -622,6 +622,7 @@ class Db extends PhpObject
 				$sQuery .= " ".$sKeyWord." * ";
 			}
 		}
+		
 		return $this->getArrayQuery(trim($sQuery), $bStringOnly, $sGroupBy);
 	}
 
diff --git a/inc/main.php b/inc/main.php
index 23a1fa4..6ae00c7 100755
--- a/inc/main.php
+++ b/inc/main.php
@@ -63,12 +63,11 @@ abstract class Main extends PhpObject
 		if($bDb) $asMandatoryClasses[] = array('name'=>'db', 'project'=>false);
 		foreach($asMandatoryClasses as $asClass) $this->oClassManagement->incClass($asClass['name'], $asClass['project']);
 		
-		$sTimeZone = ($sTimeZone=='')?Settings::TIMEZONE:$sTimeZone;
 		$this->setContext($sProcessPage, $sTimeZone);
 
 		//Init objects
 		if($bDb) {
-			$this->oDb = new Db(Settings::DB_SERVER, Settings::DB_LOGIN, Settings::DB_PASS, Settings::DB_NAME, $this->getSqlOptions() , Settings::DB_ENC, $sTimeZone);
+			$this->oDb = new Db(Settings::DB_SERVER, Settings::DB_LOGIN, Settings::DB_PASS, Settings::DB_NAME, $this->getSqlOptions() , Settings::DB_ENC);
 			if(in_array($this->oDb->sDbState, array(Db::DB_NO_DATA, Db::DB_NO_TABLE))) $this->install();
 		}
 	}
@@ -82,6 +81,7 @@ abstract class Main extends PhpObject
 	private function setContext($sProcessPage, $sTimeZone='')
 	{
 		//Browser <> PHP <> MySql synchronization
+		if($sTimeZone=='') $sTimeZone = Settings::TIMEZONE;
 		date_default_timezone_set($sTimeZone);
 		ini_set('default_charset', Settings::TEXT_ENC);
 		header('Content-Type: text/html; charset='.Settings::TEXT_ENC);