Moment timezone for local time

Get all matching timezones given a local time and a timestamp.
Moment-timezone-for-local-time is a Moment.js plugin.

// Given a timestamp, for which timezones is the local time 03:00 ?
moment.tz.forLocalTime(3, 0, new Date("2000-01-01T00:00:00Z"));
// -> ["Africa/Algiers", ..., "Europe/Paris", ...]

Installation

In browser:

<script src="https://unpkg.com/moment-timezone-for-local-time"></script>
<!-- Plugin is then available at window.momentTimezoneForLocalTime -->

In Node:

npm install moment-timezone-for-local-time

import * as momentTzForLocalTime from "moment-timezone-for-local-time"; // ES Modules
const momentTzForLocalTime = require("moment-timezone-for-local-time"); // CommonJS

You may need to install moment-timezone if not already installed.

Version compatibility

Indicates the version to use according your moment-timezone version.

moment-timezone	moment-timezone-for-local-time	notes
>= 0.5.30	1.1.0
>= 0.5.29	1.0.0	use at least moment 2.15.0 to avoid type conflicts
>= 0.2.0	0.1.1
0.1.0	0.1.0

Setup

Let's extend the moment instance

import * as moment from "moment-timezone";
momentTzForLocalTime.extend(moment); // Adds moment.tz.forLocalTime function
moment.tz.forLocalTime();

It's also possible to not extend the moment instance

const forLocalTime = momentTzForLocalTime.forLocalTime.bind(moment.tz);
forLocalTime();

Usage

// fn(hour, minute, timestamp)
forLocalTime(3, 0, new Date("2000-01-01T00:00:00Z"));
forLocalTime(3, 0, new Date("2000-01-01T00:00:00Z").getTime());
forLocalTime(3, 0, moment("2000-01-01T00:00:00Z"));
// The above 3 calls are equal

// timestamp defaults to Date.now()
forLocalTime(10, 30);

// List all timezones with the same local time as current system
forLocalTime();

Returns an array of timezone identifiers e.g. ["Africa/Algiers", ..., "Europe/Paris", ...].
The returned array can be empty when local time and timestamp don't match any timezone.

A RangeError will be thrown when:

• hour isn't in [0, 23]
• minute isn't in [0, 59]

Decimals will be floored.

// The below calls are equal
forLocalTime(3.9, 0.9, 0.9);
forLocalTime(3, 0, 0);

The result of calls to forLocalTime depends on timezone data loaded into moment. Make sure you load the right dataset for your use (e.g. 10 year range, 1970-2030, ...).

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

Dev

Fullfill the peer dependency if npm doesn't install it for you.

npm install --no-save moment-timezone@version

for version refer to package.json#peerDependencies.moment-timezone.

License

MIT