How to remove the datepicker warning in vue?

Question

Vue.js

https://github.com/darrenfang/vuetify-datetime-picker
- plugin page

Invalid prop: type check failed for prop "datetime". Expected Date, got String.

<v-datetime-picker
        :label="datetimeLabel"
        :format="datetimeFormat"
        :datetime="datetime"
        @input="updateDatetime">
</v-datetime-picker>

datetime:'',
datetimeFormat: 'YYYY-MM-DD HH:mm:ss',
datetimeLabel:'Дата публикации',

...
updateDatetime(datetime){
  this.datetime=datetime;
},