TypeError: moment().tz is not a function

Question

When testing using jasmine, I am getting this error.

TypeError: moment.tz is not a function

My code that I try to test is

let myDate = moment().tz(undefined, vm.timeZone).format('YYYY-MM-DD'); 

Answer 1

Fix

If you're using Node.js, you may accidentally be using

const moment = require('moment'); //moment

instead of

const moment = require('moment-timezone'); //moment-timezone

Also, make sure you have installed moment-timezone with

npm install moment-timezone --save

Explanation

The bug of requiring moment without timezones could occur by installing moment with require('moment'), later deciding to npm install moment-timezone, and then forgetting to update the require.

Answer 2

Below code for me...

import moment from 'moment';
import 'moment-timezone';

Answer 3

For Node.js, According to the original documentation: moment js documentation

You should do

npm install moment-timezone

Then use it like this

var moment = require('moment-timezone');
moment().tz("America/Los_Angeles").format();

Answer 4

I've encountered this problem too. It works for years, but after a refactor, it doesn't work. As I've investigated, [email protected] depends on moment@>=2.9.0, which might be different from moment itself.

In my case, moment-timezone uses [email protected], and moment itself version is 2.18.1. Causes moment-timezone decorated wrong version of moment.

I've change yarn.lock like this:

[email protected]:
  version "0.5.13"
  resolved "https://arti-dev.ss.aws.fwmrm.net/api/npm/fw-npm/moment-timezone/-/moment-timezone-0.5.13.tgz#99ce5c7d827262eb0f1f702044177f60745d7b90"
  integrity sha1-mc5cfYJyYusPH3AgRBd/YHRde5A=
  dependencies:
    moment ">= 2.9.0"

[email protected], moment@>= 2.9.0:
  version "2.18.1"
  resolved "https://arti-dev.ss.aws.fwmrm.net/api/npm/fw-npm/moment/-/moment-2.18.1.tgz#c36193dd3ce1c2eed2adb7c802dbbc77a81b1c0f"
  integrity sha1-w2GT3Tzhwu7SrbfIAtu8d6gbHA8=

moment & moment-timezone could be used substitute for each other in this case.

Answer 5

for Typescript: Works as of April 2021

import moment from 'moment';
import 'moment-timezone';

cont x = moment.tz('America/Los_Angeles').format('YYYY-MM-DD HH:mm:ss ZZ');

cont y = moment().isBetween(
            moment.tz('1-1-2021', 'America/Los_Angeles'),
            moment.tz('1-1-2021', 'America/Los_Angeles').add(2, 'hours'),

Answer 6

Moment should be a function call. So use let myDate = moment().tz(...)

See https://momentjs.com/timezone/docs/ for more details.

EDIT

You should also ensure that you are including the timezone extension to the moment library either through the correct npm install and require (for Node) or the correct script tags (for general browser usage). See the linked documents for the libraries/scripts to include.

SECOND EDIT

Should anyone have scrolled this far on a question with a +120 accepted answer:

The suggestion that moment was a function and requires brackets refers to the un-edited version of the posted question which had the syntax

let myDate = moment.tz(undefined, vm.timeZone).format('YYYY-MM-DD');