By default, the current time is set at the moment, but it needs to be 00:00

for example, now the time 21:09 is set by default to 21:09, but I need it to be 00:00

<Calendar
  v-model="filter.started_at"
  dateFormat="dd.mm.yy"
  showIcon
  iconDisplay="input"
  placeholder="date"
  class="tournaments-filter__field"
  showButtonBar
  show-time
/>

what do I need to add for this?