element-plus/docs/examples/date-picker/date-formats.vue

<template>
  <div class="demo-date-picker">
    <div class="block">
      <span class="demonstration">Emits Date object</span>
      <div class="demonstration">Value: {{ value1 }}</div>
      <el-date-picker
        v-model="value1"
        type="date"
        placeholder="Pick a Date"
        format="YYYY/MM/DD"
      >
      </el-date-picker>
    </div>
    <div class="block">
      <span class="demonstration">Use value-format</span>
      <div class="demonstration">Value：{{ value2 }}</div>
      <el-date-picker
        v-model="value2"
        type="date"
        placeholder="Pick a Date"
        format="YYYY/MM/DD"
        value-format="YYYY-MM-DD"
      >
      </el-date-picker>
    </div>
    <div class="block">
      <span class="demonstration">Timestamp</span>
      <div class="demonstration">Value：{{ value3 }}</div>
      <el-date-picker
        v-model="value3"
        type="date"
        placeholder="Pick a Date"
        format="YYYY/MM/DD"
        value-format="x"
      >
      </el-date-picker>
    </div>
  </div>
</template>

<script lang="ts">
import { defineComponent, ref } from 'vue'

export default defineComponent({
  setup() {
    const value1 = ref('')
    const value2 = ref('')
    const value3 = ref('')

    return {
      value1,
      value2,
      value3,
    }
  },
})
</script>