Sometime you need a custom input element:
<input type="text" name="my_date" class="my-custom-input" />
define an id for it:
<input type="text" name="my_date" class="my-custom-input" id="my-custom-input-id" />
then pass id to datepicker:
<date-picker v-model="..." format="..." element="my-custom-input-id" />