allow single-digit days and months without smarty_make_timestamp()

this makes dates like "1968-11-6" work correctly since no strtotime()
is involved

add warning when unknown parameter is passed

NEWS

@@ -1,3 +1,5 @@
+  - allow single-digit days and months without smarty_make_timestamp()
+    in html_select_date (messju)
   - fix headers sent erroneously with cache_modified_check and fetch()
     (wphilips, messju)
   - fix config_file path bug (Marc Cabadas, Monte)

libs/plugins/function.html_select_date.php

@@ -115,11 +115,15 @@ function smarty_function_html_select_date($params, &$smarty)
             case 'reverse_years':
                 $$_key = (bool)$_value;
                 break;
+
+            default:
+                $smarty->trigger_error("[html_select_time] unknown parameter $_key", E_USER_WARNING);
+
         }
     }
 
     // If $time is not in format yyyy-mm-dd
-    if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $time) && $time!='--') {
+    if (!preg_match('/^\d{4}-\d{1,2}-\d{1,2}$/', $time) && $time!='--') {
         // then $time is empty or unix timestamp or mysql timestamp
         // using smarty_make_timestamp to get an unix timestamp and
         // strftime to make yyyy-mm-dd