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react-day-picker can be localized into any language (English being the default).

You can either:

  • use the localization props (locale, months, weekdaysLong, weekdaysShort and firstDayOfWeek as shown in this example)
  • or use moment.js for the translations strings (e.g. if you are already including it in your project).
  • for more advanced options, such as changing the way days and captions are displayed, see advanced localization.


The following code will render react-day-picker in Italian, using Monday as first day of the week.

Open in CodeSandbox.

import React from 'react';
import DayPicker from 'react-day-picker';

const MONTHS = ['Gennaio', 'Febbraio', 'Marzo', 'Aprile', 'Maggio', 'Giugno', 'Luglio', 'Agosto', 'Settembre', 'Ottobre', 'Novembre', 'Dicembre'];
const WEEKDAYS_LONG = ['Domenica', 'Lunedì', 'Martedì', 'Mercoledì', 'Giovedì', 'Venerdì', 'Sabato'];
const WEEKDAYS_SHORT = ['Do', 'Lu', 'Ma', 'Me', 'Gi', 'Ve', 'Sa'];

export default function Localized() {
  return (

Localization with moment.js

If you already use moment.js in your dependencies, you may find convenient to use moment’s translation strings.

  1. make sure moment is included in your dependencies
  2. make sure the required moment’s locale data is available when rendering react-day-picker (see example below)
  3. import MomentLocaleUtils from react-day-picker/moment and pass it to the localeUtils props
  4. use the locale prop to set the locale in react-day-picker


The following component shows four react-day-pickers, in English, Japanese, Arabic and Italian.

Open in CodeSandbox.

import React from 'react'; 
import ReactDOM from 'react-dom';

import DayPicker from 'react-day-picker';

// Include the locale utils designed for moment
import MomentLocaleUtils from 'react-day-picker/moment';

import 'react-day-picker/lib/style.css';

// Make sure moment.js has the required locale data
import 'moment/locale/ja';
import 'moment/locale/ar';
import 'moment/locale/it';

export default function LocalizedExample() {
  return (

      <DayPicker localeUtils={MomentLocaleUtils} locale="en" />

      <DayPicker localeUtils={MomentLocaleUtils} locale="ja" />

      <DayPicker localeUtils={MomentLocaleUtils} locale="ar" />

      <DayPicker localeUtils={MomentLocaleUtils} locale="it" />


Advanced localization

Internally, react-day-picker uses LocaleUtils, a set of formatting functions. You can overwrite its behavior by passing your own custom functions to the localeUtils props.


In the following example, a custom localeUtils object is used to localize the calendar in English or in Italian.

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import React from 'react';
import DayPicker from 'react-day-picker';

  en: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
  it: ['Domenica', 'Lunedì', 'Martedì', 'Mercoledì', 'Giovedì', 'Venerdì', 'Sabato'],
  en: ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'],
  it: ['D', 'L', 'M', 'M', 'G', 'V', 'S'],

const MONTHS = {
  en: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
  it: ['Gennaio', 'Febbraio', 'Marzo', 'Aprile', 'Maggio', 'Giugno', 'Luglio', 'Agosto', 'Settembre', 'Ottobre', 'Novembre', 'Dicembre'],

const FIRST_DAY = {
  en: 0,
  it: 1, // Use Monday as first day of the week

const localeUtils = {
  formatDay: (d, locale = 'en') =>
    `${weekdaysLong[locale][d.getDay()]}, ${d.getDate()} ${months[locale][
    ]} ${d.getFullYear()}`,
  formatMonthTitle: (d, locale) =>
    `${MONTHS[locale][d.getMonth()]} ${d.getFullYear()}`,
  formatWeekdayShort: (i, locale) => WEEKDAYS_SHORT[locale][i],
  formatWeekdayLong: (i, locale) => WEEKDAYS_LONG[locale][i],
  getFirstDayOfWeek: locale => FIRST_DAY[locale],

export default function MyComponent() {
  return <DayPicker locale="it" localeUtils={localeUtils} />;