discourse/app/assets/javascripts/select-kit/addon/templates/components/period-chooser/period-chooser-header.hbs

<h2 class="selected-name" title={{title}} role="option">
  {{period-title value
    showDateRange=true
    fullDay=selectKit.options.fullDay
  }}
</h2>

{{d-icon caretIcon class="caret-icon"}}