JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vuetify.min.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/vuetify.min.css">
<script src="https://fonts.googleapis.com/css?family=Material+Icons"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@mdi/[email protected]/css/materialdesignicons.min.css">
<div id="app">
  <v-app id="inspire">
    <v-row justify="center">
      <ul v-for="user in users">
        <li>{{user.id}}</li>
        <li>{{user.name}}</li>
        <li>{{user.phone}}</li>
      </ul>
      <v-date-picker v-model="picker">
      </v-date-picker>
    </v-row>
  </v-app>
</div>

JavaScript

new Vue({
  el: '#app',
  vuetify: new Vuetify(),
  data: {
    users:[{
      id:"1",
      name:"test_name",
      birthday:"21-02-2020",
      phone:"2222222222"
    }],
    picker: null,
  },
  methods: {
  	parseDate(date) {
    	const parsedDate = date.split('-').reverse().join('-')
			return parsedDate;
    }
  },
  mounted () {
    this.picker = this.parseDate(this.users[0].birthday)
    console.log(this.picker)
  }
})