Intl.DateTimeFormat timezone polyfill

Surgically polyfills timezone support in Intl.DateTimeFormat API

Some browsers do not support arbitrary time zone in Intl.DateTimeFormat API (becuase its optional as per ECMA-402 standard). This polyfill is only to bring this support. Polyfill contains historical timezone data, CLDR data & tiny code to polyfill this support.

How to use?

1. Install via nodejs:

npm i date-time-format-timezone

And then import in your code:

require('date-time-format-timezone'); // polyfill is ready

1. In the browser

include everything:

<script src="https://unpkg.com/date-time-format-timezone@latest/build/browserified/date-time-format-timezone-complete-min.js">

or include individual files:

<script src="https://unpkg.com/date-time-format-timezone@latest/build/browserified/date-time-format-timezone-no-data-min.js">
<script src="https://unpkg.com/date-time-format-timezone@latest/build/browserified/data/locales/locale-en-US-POSIX.js">
<script src="https://unpkg.com/date-time-format-timezone@latest/build/browserified/data/metazone.js">
<script src="https://unpkg.com/date-time-format-timezone@latest/build/browserified/data/timezones/tzdata-america-los_angeles.js">

This polyfill can add this support.

new Intl.DateTimeFormat('hi', {
    timeZone: 'Asia/Calcutta',
    timeZoneName:'long',
    year: 'numeric',
    month: 'numeric',
    day: 'numeric',
    hour: 'numeric',
    minute: 'numeric',
}).format(new Date());
 
"११/१/२०१७, पू १:२६ भारतीय मानक समय"
 
 
new Intl.DateTimeFormat('en', {
    timeZone: 'America/Los_Angeles',
    timeZoneName:'long',
    year: 'numeric',
    month: 'numeric',
    day: 'numeric',
    hour: 'numeric',
    minute: 'numeric',
}).format(new Date());
 
"1/10/2017, 12:00 PM Pacific Standard Time"

Support

Generate latest data from www.iana.org.

git checkout https://github.com/yahoo/date-time-format-timezone.git
npm install
grunt download
grunt
npm publish

Browserified file size

*1. top zones are custom listed timezones here.

*2. top locales are custom listed locales here.

References

1. http://www.unicode.org/reports/tr35/tr35-dates.html#Using_Time_Zone_Names
2. http://icu-project.org/apiref/icu4j/com/ibm/icu/text/TimeZoneNames.html