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+# Internationalization
+
+## Table of Contents
+
+- [Usage](#usage)
+
+- [Adding New Language](#adding-new-language)
+
+## Usage
+
+There are just a few functions that support I18n:
+
+- [`format`](https://date-fns.org/docs/format)
+- [`formatDistance`](https://date-fns.org/docs/formatDistance)
+- [`formatDistanceStrict`](https://date-fns.org/docs/formatDistanceStrict)
+- [`formatRelative`](https://date-fns.org/docs/formatRelative)
+
+To use a locale, you need to require it and then pass
+as an option to a function:
+
+```js
+import { formatDistance } from 'date-fns'
+// Require Esperanto locale
+import { eo } from 'date-fns/locale'
+
+const result = formatDistance(
+  new Date(2016, 7, 1),
+  new Date(2015, 0, 1),
+  {locale: eo} // Pass the locale as an option
+)
+//=> 'pli ol 1 jaro'
+```
+
+It might seem complicated to require and pass locales as options,
+but unlike Moment.js which bloats your build with all the locales
+by default date-fns forces developer to manually require locales when needed.
+To make API simple, we encourage you to write tiny wrappers and use those
+instead of original functions:
+
+```js
+// app/_lib/format.js
+
+import { format } from 'date-fns'
+import { enGB, eo, ru } from 'date-fns/locale'
+
+const locales = {enGB, eo, ru}
+
+// by providing a default string of 'PP' or any of its variants for `formatStr`
+// it will format dates in whichever way is appropriate to the locale
+export default function (date, formatStr = 'PP') {
+  return format(date, formatStr, {
+    locale: locales[window.__localeId__] // or global.__localeId__
+  })
+}
+
+// Later:
+
+import format from 'app/_lib/format'
+
+window.__localeId__ = 'enGB'
+format(friday13, 'EEEE d')
+//=> 'Friday 13'
+
+window.__localeId__ = 'eo'
+format(friday13, 'EEEE d')
+//=> 'vendredo 13'
+
+// If the format string is omitted, it will take the default for the locale.
+window.__localeId__ = 'enGB'
+format(friday13)
+//=> Jul 13, 2019
+
+window.__localeId__ = 'eo'
+format(friday13)
+//=> 2019-jul-13
+
+```
+
+## Adding New Language
+
+At the moment there is no definitive guide, so if you feel brave enough,
+use this quick guide:
+
+- First of all, [create an issue](https://github.com/date-fns/date-fns/issues/new?title=XXX%20language%20support)
+  so you won't overlap with others.
+- A detailed explanation of how to [add a new locale](https://github.com/date-fns/date-fns/blob/master/docs/i18nContributionGuide.md#adding-a-new-locale).
+- Use [English locale](https://github.com/date-fns/date-fns/tree/master/src/locale/en-US)
+  as the basis and then incrementally adjust the tests and the code.
+- Directions on [adding a locale with the same language as another locale](https://github.com/date-fns/date-fns/blob/master/docs/i18nContributionGuide.md#creating-a-locale-with-the-same-language-as-another-locale).
+- If you have questions or need guidance, leave a comment in the issue.
+
+Thank you for your support!