grzanieplus.pl/plugins/stTaskScheluderPlugin/modules/stTaskScheluderBackend/templates/_time_interval.php

<?php 
/**
 * @var Task $task
 */
use_helper('stTaskScheluder');

echo st_task_scheluder_time_interval_select_tag('task[time_interval]', $task->getTimeInterval(), [
    'default_time_interval' => $task->getDefaultTimeInterval(),
]);