Registry / serialization / jstimezonedetect

jstimezonedetect

library1.0.7jsnpmunverified

jstimezonedetect is a JavaScript library designed to determine the IANA time zone key (also known as the Olson time zone database) of the user's device. As of version 1.0.7, released in 2018, the project appears to be in maintenance mode with infrequent updates, and no active development is indicated for new time zone rule changes. Its primary utility lies in obtaining a standardized time zone identifier for server-side date and time normalization without requiring user interaction. A key differentiator is its specific scope: it focuses exclusively on *modern* time zones, typically from 2010 onwards, and intentionally disregards historical time zone data or geographical location-based detection. This targeted approach means it will not differentiate between time zones that share identical modern rules (e.g., Europe/Berlin and Europe/Stockholm if their current rules align) nor provide granular historical offsets.

serialization

npm install jstimezonedetect

github ↗package ↗

INSTALL

IMPORT

SIG · JSTIMEZONEDETECT

jstimezonedetect

serializationjavascriptv1.0.7

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

jstz

✓ const jstz = require('jstimezonedetect');

✗ import jstz from 'jstimezonedetect';

Primarily a CommonJS module for Node.js environments. For ESM, direct import might require a compatibility layer or bundler configuration.

jstz (browser global)

✓ // Include <script src="path/to/dist/jstz.min.js"></script> // 'jstz' object is then available globally

For web environments, the library exposes the 'jstz' object directly onto the global scope after the script is loaded.

Demonstrates how to use jstimezonedetect in a Node.js environment to detect and log the client's IANA time zone name.

const jstz = require('jstimezonedetect'); try { const tz = jstz.determine(); console.log('Detected IANA Time Zone:', tz.name()); } catch (error) { console.error('Error detecting time zone:', error.message); }

Debug

Known issues

gotchajstimezonedetect explicitly focuses on modern time zones (from 2010 onwards) and does not provide historical time zone data. It will not detect differences in UTC offsets for dates prior to 2010.

fix

If historical time zone data is required, consider a more comprehensive library like `moment-timezone` or `luxon`.

affects: >=1.0.0

gotchaThis library does not perform geo-location. It determines the time zone based on the device's system settings, not its physical location. As such, it won't differentiate between zones with identical modern rules but different geographical names (e.g., 'Europe/Berlin' vs 'Europe/Stockholm').

fix

For geo-location based time zone detection, you would need to integrate with a separate geo-location service or library that provides time zone information based on coordinates.

affects: >=1.0.0

gotchaThe project appears to be in maintenance mode, with its last release in 2018. This means it may not receive updates for changes in IANA time zone rules, potentially leading to outdated or incorrect time zone detections in regions with recent rule adjustments.

fix

For applications requiring up-to-date time zone rules, consider libraries that are actively maintained and frequently update their time zone data, such as `luxon` or `date-fns-tz`.

affects: >=1.0.0

gotchaThe library might not provide a consistent IANA time zone name across all browsers or operating systems, as it relies on internal browser/OS heuristics to determine the zone. While it aims for IANA keys, the underlying mechanism can vary.

fix

Test thoroughly across target environments. If inconsistencies are critical, consider explicit user input or a server-side detection fallback.

affects: >=1.0.0

Errors

Common errors & fixes

ReferenceError: jstz is not defined

The jstz script file was not loaded or executed in the browser environment before attempting to use the `jstz` global object.

fix

Ensure that `<script src="path/to/jstz.min.js"></script>` is included in your HTML before any code that tries to use `jstz`.

ReferenceError: require is not defined

Attempting to use `require('jstimezonedetect')` in a browser environment or a pure ESM Node.js module without a compatible bundler or transpilation.

fix

For browsers, load the script via a `<script>` tag. For ESM modules in Node.js, you might need to use `import jstz from 'jstimezonedetect';` with appropriate `type: 'module'` in package.json or rely on a bundler like Webpack or Rollup to handle CommonJS interoperability.

TypeError: jstz.determine is not a function

The `jstz` object was not correctly imported or exposed, meaning the `determine` method is unavailable.

fix

Verify your import statement (e.g., `const jstz = require('jstimezonedetect');` for CJS) or ensure the global `jstz` object is available in the browser. Check if other scripts are overwriting the `jstz` global.

Upgrade

Version history

1.0.7latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

7 hits · last 30 days

node

Amazon

Resources

githubhttps://github.com/pellepim/jstimezonedetect ↗

packagehttps://www.npmjs.com/package/jstimezonedetect ↗