Resolved issue 0000900: format_date function doesn't work when time is omitted with 'mysql_datetime' type

Continue correction of grum

git-svn-id: http://piwigo.org/svn/trunk@2856 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions.inc.php

@@ -601,6 +601,14 @@ function format_date($date, $type = 'us', $show_time = false)
         array($out[1],$out[2],$out[3],$out[4],$out[5],$out[6]);
       break;
     }
+    case 'mysql_date' :
+    {
+      preg_match('/^(\d{4})-(\d{2})-(\d{2})$/',
+                 $date, $out);
+      list($year,$month,$day) =
+        array($out[1],$out[2],$out[3]);
+      break;
+    }
   }
   $formated_date = '';
   // before 1970, Microsoft Windows can't mktime