moment转化时间戳出现Invalid Date的问题及解决

// 转换数字类型
beginTime: this.$moment(Number(item.beginTime)).format(
 "YYYY-MM-DD"
),

 endTime:
	   item.endTime == ""
	     ? ""
	     : this.$moment(Number(item.endTime)).format("YYYY-MM-DD"),

cnpm install moment --save

import moment from 'moment'; 

{
  "users": [
    {
        "startTime":"1572502840091",
        "endTime":"1572512489920"
    }, {
      "startTime":"1572512489920",
      "endTime":"1572513935374"
    }
]
}

import React from 'react';
import axios from 'axios';
import moment from 'moment';
class Time extends React.Component {
  //构造函数
  constructor() {
    super();
    //react定义数据
    this.state = {
      list: []
    }
  }
  //请求接口的方法
  getData = () => {
    var api = 'http://localhost:3004/users';
    axios.get(api)
      .then((response) => {
        // handle success
        console.log(response.data);
        //用到this需要注意指向，箭头函数
        this.setState({
          list: response.data
        })
      })
      .catch(function (error) {
        // handle error
        console.log(error);
      });
  }
  render() {
    return (
      <div>
        <h2>时间戳转化为时间</h2>
        <button onClick={this.getData}>获取时间</button>
        <ul>
          {
            this.state.list.map((value, key) => {
              let start = moment(parseInt(value.startTime)).format('YYYY/MM/DD hh:mm:ss');
              let end = moment(parseInt(value.endTime)).format('YYYY/MM/DD hh:mm:ss');
              return (
                <li key={key}>
                  <span>开始时间：{start}</span>
                  <span>结束时间：{end}</span>
                </li>
              )
            })
          }
        </ul>
      </div>
    )
  }
}
export default Time;