small fix but need refactor

Author: Dmi3yy

core/src/Core.php

@@ -4689,6 +4689,8 @@ public function toDateFormat($timestamp = 0, $mode = '')
                 $strTime = strftime($dateFormat, $timestamp);
             } elseif ($mode === 'formatOnly') {
                 $strTime = $dateFormat;
+            } elseif ($mode === 'timeOnly') {
+                $strTime = $dateFormat;
             }
         }