npm install moment-timezone --save

package.json

     "js-cookie": "2.2.0",
     "lodash": "^4.17.4",
     "moment": "^2.19.4",
+    "moment-timezone": "^0.5.14",
     "normalize.css": "7.0.0",
     "nprogress": "0.2.0",
     "vue": "2.5.9",