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You can apply the formatTimestamp function with the v-data-table component by creating a custom computed property that formats the timestamp data before rendering it in the table.

Here is an example:

<template>
  <v-data-table :headers="headers" :items="itemsWithFormattedDate"></v-data-table>
</template>

<script>
export default {
  data() {
    return {
      items: [
        { id: 1, timestamp: 1625184000000 },
        { id: 2, timestamp: 1625270400000 },
        { id: 3, timestamp: 1625356800000 },
      ],
      headers: [
        { text: 'ID', value: 'id' },
        { text: 'Date', value: 'formattedTimestamp' },
      ],
    };
  },
  computed: {
    itemsWithFormattedDate() {
      return this.items.map(item => ({
        ...item,
        formattedTimestamp: this.formatTimestamp(item.timestamp),
      }));
    },
  },
  methods: {
    formatTimestamp(timestamp) {
      // your timestamp formatting logic goes here
    },
  },
};
</script>

In this example, we first define an array of items that contain a timestamp property. We also define headers for the table to display the ID and formatted timestamp.

We then create a computed property called itemsWithFormattedDate that maps over the original items array and adds a formattedTimestamp property to each item using the formatTimestamp method.

Finally, we render the v-data-table component with the new itemsWithFormattedDate array as the items prop. The formatted timestamp data is now displayed in the table.