Fix fatal error when using DMY- or MDY-based date format in PostgreSQL (#5808)

CHANGELOG

@@ -21,6 +21,7 @@ CHANGELOG Roundcube Webmail
 - Fix style issue on selected and unfocused message that is part of a thread (#5798)
 - Fix bug where a.button style from managesieve plugin could impact other elements (#5800)
 - Fix position of selected icon for (Mailvelope) Encrypt button
+- Fix fatal error when using DMY- or MDY-based date format in PostgreSQL (#5808)
 
 RELEASE 1.3.0
 -------------

program/lib/Roundcube/rcube_db_pgsql.php

@@ -3,7 +3,7 @@
 /**
  +-----------------------------------------------------------------------+
  | This file is part of the Roundcube Webmail client                     |
- | Copyright (C) 2005-2012, The Roundcube Dev Team                       |
+ | Copyright (C) 2005-2017, The Roundcube Dev Team                       |
  |                                                                       |
  | Licensed under the GNU General Public License version 3 or            |
  | any later version with exceptions for skins & plugins.                |
@@ -52,6 +52,7 @@ class rcube_db_pgsql extends rcube_db
     protected function conn_configure($dsn, $dbh)
     {
         $dbh->query("SET NAMES 'utf8'");
+        $dbh->query("SET DATESTYLE TO ISO");
     }
 
     /**