Library to get first day of week.

getWeekStartByRegion('MAC');   // 0

getWeekStartByLocale('arq');   // 6

The library is based on the following data from Unicode (especially from Common Locale Data Repository) and from ISO:

• https://unicode-org.github.io/cldr-staging/charts/latest/supplemental/territory_information.html
• https://github.com/unicode-org/cldr-json/blob/main/cldr-json/cldr-core/supplemental/weekData.json
• https://unicode-org.github.io/cldr-staging/charts/latest/supplemental/territory_language_information.html
• https://unicode-org.github.io/cldr-staging/charts/latest/supplemental/language_territory_information.html
• https://unicode-org.github.io/cldr-staging/charts/latest/supplemental/scripts_languages_and_territories.html
• http://www.unicode.org/reports/tr35/tr35.html#Unicode_Language_and_Locale_Identifiers
• https://www.iso.org/iso-3166-country-codes.html

There are 2 variants of the library having identical API:

• main - uses base mapping of language code to country code from langRegionMap.
• full - uses full mapping of language code to country code from fullLangRegionMap.

langRegionMap contains only main language codes. It is data subset from fullLangRegionMap.

• Installation
• Usage
• Examples
• API
• Contributing
• License

npm install weekstart

bower install weekstart

Use dist/main.js or dist/min/main.js (minified version). Use dist/full.js or dist/min/full.js (minified version) when you need full locale data.

import {getWeekStartByLocale, getWeekStartByRegion} from 'weekstart';

If you need full data:

import {getWeekStartByLocale, getWeekStartByRegion} from 'weekstart/full';

const getWeekStartByLocale = require('weekstart').getWeekStartByLocale;
const getWeekStartByRegion = require('weekstart').getWeekStartByRegion;

If you need full data:

const getWeekStartByLocale = require('weekstart/full').getWeekStartByLocale;
const getWeekStartByRegion = require('weekstart/full').getWeekStartByRegion;

define(['path/to/dist/main.js'], function(weekstart) {
    const getWeekStartByLocale = weekstart.getWeekStartByLocale;
    const getWeekStartByRegion = weekstart.getWeekStartByRegion;
});

If you need full data:

define(['path/to/dist/full.js'], function(weekstart) {
    const getWeekStartByLocale = weekstart.getWeekStartByLocale;
    const getWeekStartByRegion = weekstart.getWeekStartByRegion;
});

<!-- Use bower_components/weekstart/dist/main.js and bower_components/weekstart/dist/full.js if the library was installed by Bower -->
<script type="text/javascript" src="path/to/dist/main.js"></script>
<script type="text/javascript">
    // weekstart is available via weekstart field of window object
    const getWeekStartByLocale = weekstart.getWeekStartByLocale;
    const getWeekStartByRegion = weekstart.getWeekStartByRegion;
</script>

If you need full data use path/to/dist/full.js instead of path/to/dist/main.js.

getWeekStartByRegion('dj');   // 6
getWeekStartByRegion('No');   // 1
getWeekStartByRegion('CAN');   // 0
getWeekStartByRegion(462);   // 5

getWeekStartByLocale('Jam');   // 0
getWeekStartByLocale('Fa');   // 6
getWeekStartByLocale('vi');   // 1
getWeekStartByLocale('es_MX');   // 0
getWeekStartByLocale('az-Arab-IRN');   // 6

In the following examples results are given for the function from full.js. The same calls for the function from main.js will return 1.

getWeekStartByLocale('CCP');   // 0
getWeekStartByLocale('UZ-arab');   // 6

Return first day of week for locale identifier: 0 - Sunday, 1 - Monday, 2 - Tuesday, 3 - Wednesday, 4 - Thursday, 5 - Friday, 6 - Saturday.

Return first day of week for country/region code: 0 - Sunday, 1 - Monday, 2 - Tuesday, 3 - Wednesday, 4 - Thursday, 5 - Friday, 6 - Saturday.

See docs for details.

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code.

Licensed under the MIT license.