throwExeptions(true);
$update_datetime = array(
	'{chatthread}' => array(
		'dtmcreated',
		'dtmchatstarted',
		'dtmmodified',
		'lastpinguser',
		'lastpingagent'
	),
	'{chatmessage}' => array(
		'dtmcreated'
	),
	'{chatoperator}' => array(
		'dtmlastvisited',
		'dtmrestore'
	),
	'{chatban}' => array(
		'dtmcreated',
		'dtmtill'
	),
	'{chatsitevisitor}' => array(
		'firsttime',
		'lasttime',
		'invitationtime'
	),
	'{visitedpage}' => array(
		'visittime'
	),
	'{visitedpagestatistics}' => array(
		'visittime'
	)
);
foreach($update_datetime as $table => $columns) {
	echo("Table: {$table}
");
	foreach($columns as $column) {
		echo("-- Column: {$column}
");
		$db->query("ALTER TABLE {$table} CHANGE {$column} {$column}_tmp datetime");
		$db->query("ALTER TABLE {$table} ADD COLUMN {$column} int NOT NULL DEFAULT 0 AFTER {$column}_tmp");
		$db->query("UPDATE {$table} SET {$column} = UNIX_TIMESTAMP({$column}_tmp)");
		$db->query("ALTER TABLE {$table} DROP COLUMN {$column}_tmp");
	}
}
?>