npm i -S vue-time-range

import Vue from 'vue';
import Vuex from 'vuex';
import TimeRange from 'vue-time-range';
import Buefy from 'buefy';
import 'buefy/lib/buefy.min.css';

Vue.use(Vuex);
Vue.use(Buefy);

const store = new Vuex.Store();

Vue.use(TimeRange, {
  store
});

new Vue({
    store,
    //...
});

this.$store.state.TimeRange.dateTimeStart
this.$store.state.TimeRange.dateTimeEnd

this.$store.commit('TimeRange/EDIT_DATE_TIME_START', new Date())
this.$store.commit('TimeRange/EDIT_DATE_TIME_END', new Date())