<template>
  <span>{{ timer }}</span>
</template>

<script>

  data () {
    return {
      now: '',
    }
  },

  created () {
    this.getServerTime ();
  },

  computed: {
    timer () {
      return moment (this.now).format ('YYYY/MM/DD HH:mm:ss');
    }
  },

  methods: {
    getServerTime () {
      let $vmc = this;
      Axios.get ([API])
        .then (resp => {
          $vmc.now = resp;
          setInterval (() => $vmc.now += 1000, 1000);
        })
    }
  }

</script>