Bug 1744 fixed : Incorrect use of timezone with SQLite

Fixed anti-flood system.

Merge from trunk

git-svn-id: http://piwigo.org/svn/branches/2.1@6605 68402e56-0260-453c-a942-63ccdbb3a9ee

include/dblayer/functions_sqlite.inc.php

@@ -511,6 +511,11 @@ function pwg_db_get_recent_period($period, $date='CURRENT_DATE')
   return $d;
 }
 
+function pwg_db_get_flood_period_expression($seconds)
+{
+  return 'datetime(\'now\', \'localtime\', \''.-$seconds.' seconds\')';
+}
+
 function pwg_db_get_hour($date)
 {
   return 'strftime(\'%H\', '.$date.')';