diff --git a/index.html b/index.html
index 1f45f45..32bab29 100644
--- a/index.html
+++ b/index.html
@@ -819,6 +819,7 @@ var effect = (VANTA.CLOUDS2 || VANTA.CLOUDS)({
         function pad3(n) { return n < 10 ? '00' + n : n < 100 ? '0' + n : '' + n; }
 
         function formatDateTime(format, date) {
+            console.log('formatDateTime called', format, 'lang=', window.CONFIG && window.CONFIG.language);
             // Strict ISO 8601 format tokens (case-sensitive):
             //   YYYY  4-digit year         (2026)
             //   MM    month 01-12          (10) -- always month, never minute