// UnixTimeのtimestampを取得　timestamp:1557563656298
const {timestamp} = geoData 

// UnixTimeからDateオブジェクトを作成
date = new Date(timestamp)　

// Dateオブジェクトをフォーマットして表示する　2019/05/11 17:34:16
console.log(this.formatDate(date,"yyyy/MM/dd HH:mm:ss"))

  formatDate (date, format) {
    format = format.replace(/yyyy/g, date.getFullYear());
    format = format.replace(/MM/g, ('0' + (date.getMonth() + 1)).slice(-2));
    format = format.replace(/dd/g, ('0' + date.getDate()).slice(-2));
    format = format.replace(/HH/g, ('0' + date.getHours()).slice(-2));
    format = format.replace(/mm/g, ('0' + date.getMinutes()).slice(-2));
    format = format.replace(/ss/g, ('0' + date.getSeconds()).slice(-2));
    format = format.replace(/SSS/g, ('00' + date.getMilliseconds()).slice(-3));
    return format;
  }