time.es

const state = {
  now: new Date
}

const actions = {
  start ({ commit }) {
    setInterval(() => {
      commit('updateTime')
    }, 1000 * 60)
  }
}

const mutations = {
  updateTime (state) {
    state.now = new Date
  }
}

Thanks for your write up about this at https://cushionapp.com/journal/reactive-time-with-vuejs. I was just about to try and implement something like this when I stumbled upon your article. I'm creating an app that uses time and date in multiple components and I was doing it like you did with setInterval(() => this.now = new Date, 1000 * 60) in multiple components. I was already using Vuex so your solution made sense as soon as I saw it.