Fixed: FS#2418 - PHP: Timezone ID 'CEST' is invalid

install/install.php

@@ -105,9 +105,15 @@ $inst->find_installed_apps();
 //** Select the language and set default timezone
 $conf['language'] = $inst->simple_query('Select language', array('en','de'), 'en');
 
-exec('date +%Z', $tmp_out);
-$conf['timezone'] = $tmp_out[0];
+exec('date +%z', $tmp_out);
+$tmp_zone = intval($tmp_out[0]);
+if(substr($tmp_out[0],0,1) == '+') {
+	$conf['timezone'] = 'Etc/GMT+'.$tmp_zone;
+} else {
+	$conf['timezone'] = 'Etc/GMT-'.$tmp_zone;
+}
 unset($tmp_out);
+unset($tmp_zone);
 
 //* Set defaukt theme
 $conf['theme'] = 'default';