text: document.addEventListener('DOMContentLoaded', function () {
      var calendarEl = document.getElementById('calendario');
      var calendar = new FullCalendar.Calendar(calendarEl, {
          initialView: 'dayGridMonth',
          locale: 'es',
          firstDay: 0,
          headerToolbar: {
              left: 'prev,next today',
              center: 'title',
              right: 'dayGridMonth,timeGridWeek,timeGridDay,listWeek'
          },
          themeSystem: 'bootstrap',
          events: 'calendario/mostrar',
      });
      calendar.render();
  });
  