Add cache inclalidation for Chronological

syntax/calendar.php

@@ -72,6 +72,8 @@ class syntax_plugin_luxtools_calendar extends SyntaxPlugin
         if ($format !== 'xhtml') return false;
         if (!($renderer instanceof Doku_Renderer_xhtml)) return false;
 
+        $renderer->nocache();
+
         if (!($data['ok'] ?? false)) {
             $message = (string)$this->getLang((string)($data['error'] ?? 'calendar_err_badmonth'));
             if ($message === '') $message = 'Invalid calendar month. Use YYYY-MM.';