TypeError: moment().tz is not a function

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.

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'),

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();

Below code for me...

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