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This library consists of four sets of APIs (each described in detail below) to format and parse numbers, dates and times in JavaScript.

Why not just use the standard ECMAScript Internationalization API (ECMA-402) and related polyfills? Firstly, the standard doesn't include any parsing functionality. Additionally, Brightspace supports fine-grained locale customization at the organization and user levels -- a level of configuration that simply isn't present in the standard. This library does attempt to follow the standard API syntax and naming conventions when possible.

Installation & Usage

Install from NPM:

npm install d2l-intl


In NPM, require it normally:

const d2lIntl = require('d2l-intl');


In ES6, use an import statement:

import d2lIntl from 'd2l-intl';


If you're using Polymer to write a web component or application, use d2l-localize-behavior instead, as it wraps d2l-intl and exposes its functionality.

Specifying Locales

Each of the APIs have a locales argument, which must be a string language tag (or array of language tags) matching a locale supported by Brightspace. A list of all supported locales can be found in the locale-data directory.

For example, to create a number formatter using the French Canadian (fr-CA) locale:

var formatter = new d2lIntl.NumberFormat('fr-CA');

If the provided locale isn't supported (e.g. fr-BE), the base language (fr) will be used.

If an array of language tags is provided, the resolved locale will be the first supported locale.

Overriding Locale Data

All locale data can be overridden by providing a locale option. Only the settings you specify will be overridden. For example, to use the tr-TR locale, but override the decimal symbol (which for Turkish is a comma):

var options = {
    locale: {
        number: {
            symbols: {
                decimal: '.'
new d2lIntl.NumberFormat('tr-TR', options).format(3.14); // -> 3.14

The full set of overridable locale data can be found by inspecting one of the JSON files in the locale-data directory.

Retrieving Locale Data

All locale data can be retrieved by providing a 'locale' option. The locale data can be overridden.

var localeData = d2lIntl.LocaleProvider('fr');

Number Formatting

Integer and decimal numbers can be formatted in the user's locale using the NumberFormat class. It intentionally mirrors the ECMA-402 Intl.NumberFormat class.


var formatter = new d2lIntl.NumberFormat(locales[, options]);


  • locale: see overriding locale data
  • style: the number format style to use. Possible values are "decimal" or "percent"; the default is "decimal".
  • minimumFractionDigits: The minimum number of fraction digits to use. Possible values are from 0 to 20; the default is 0.
  • maximumFractionDigits: The maximum number of fraction digits to use. Possible values are from 0 to 20; the default is the larger of minimumFractionDigits and 3.

Example 1: formatting as an integer (rounded to 0 decimal places)

var formatter = new d2lIntl.NumberFormat('en', {
    maximumFractionDigits: 0
console.log(formatter.format(89.72)); // -> 90

Example 2: formatting as a percentage (rounded to 2 decimal places, but always showing at least 2 decimals)

var formatter = new d2lIntl.NumberFormat('en', {
    style: 'percent',
    minimumFractionDigits: 2,
    maximumFractionDigits: 2
console.log(formatter.format(0.333)); // -> 33.30%

Number Parsing

The NumberParse object can be used to parse an integer or decimal number written in the user's locale.


var parser = new d2lIntl.NumberParse(locales[, options]);



var parser = new d2lIntl.NumberParse('fr-CA');
console.log(parser.parse('-8 942,39')); // -> -8942.39

Date/Time Formatting

Dates and times can be formatted in the user's locale using the DateTimeFormat class. It behaves similar to the ECMA-402 Intl.DateTimeFormat class.


var formatter = new d2lIntl.DateTimeFormat(locales[, options]);


  • locale: see overriding locale data
  • format: which pattern to use when rendering the date-time; default is "short".
    • full: long weekday, month names and timezone. e.g. "Wednesday, September 23, 2015 1:25 PM EST"
    • medium: long month names. e.g. "September 23, 2015 1:25 PM"
    • short: abbreviated date format. e.g. "9/23/2015 1:25 PM"
    • monthYear: month and year only. e.g. "September 2015"
    • monthDay: month and day only. e.g. "September 23"
    • longDayOfWeek: long weekday only. e.g. "Wednesday"
    • shortDayOfWeek: short weekday only. e.g. "Wed"
    • longMonth: long month only. e.g. "September"
    • shortMonth: short month only. e.g. "Sep"

All the date and time formatting methods take a JavaScript Date object as input.

To format a date and time, use the format method:

var formatter = new d2lIntl.DateTimeFormat('sv-SE');
var time = formatter.format(
    new Date(2015, 8, 23, 14, 5)
); // -> 2015-09-23 14:05

To format a time only (without the date portion), use the formatTime method:

var formatter = new d2lIntl.DateTimeFormat('ko');
var time = formatter.formatTime(
    new Date(2015, 8, 23, 14, 5)
); // -> 오후 14:05

To format a date only (without the time portion), use the formatDate method:

var formatter = new d2lIntl.DateTimeFormat('es-MX', {
    format: 'full'
    formatter.formatDate(new Date(2015, 8, 23))
); // -> miércoles 23 de septiembre de 2015

Date/Time Parsing

The DateTimeParse object can be used to parse a date or time written in the user's locale.


var parser = new d2lIntl.DateTimeParse(locales[, options]);


Both the parseDate and parseTime methods take a string input and return a JavaScript Date object.

To parse a time, use the parseTime method:

var parser = new d2lIntl.DateTimeParse('fr-CA');
var time = parser.parseTime('14 h 05');
    time.getHours(), // -> 14
    time.getMinutes() // -> 5

To parse a date, use the parseDate method:

var parser = new d2lIntl.DateTimeParse('fr-CA');
var date = parser.parseDate('2015-09-23');
    date.getFullYear(), // -> 2015
    date.getMonth(), // -> 8 (months are 0-11)
    date.getDate() // -> 23

File Size Formatting

The FileSizeFormat object can be used to format a file size appropriately for the user's locale.


var formatFS = new d2lIntl.FileSizeFormat(locale[, options]);

To format a file size, call the format method:

var formatFS = new d2lIntl.FileSizeFormat('en-US');
var fileSize = formatFS.format(100);
console.log(fileSize) // -> 100 Bytes


Contributions are welcome, please submit a pull request!

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