Localization

Localization controls every word the calendar shows users - toolbar labels, view names, editor field captions, accessibility strings - plus the date and time format strings used by titles, axis headers, and the agenda. You wire it in by wrapping <Calendar> (and its companions) in the <Locale> component from @svar-ui/react-core and passing a merged dictionary.

Default Locale

Without a <Locale> wrapper, the calendar falls back to English. The minimal setup needs no locale wiring at all:

import { Calendar } from "@svar-ui/react-calendar";

<Calendar events={events} date={date} />

The default English dictionary lives in @svar-ui/calendar-locales as en and pairs with en from @svar-ui/core-locales for shared widgets (segmented controls, date pickers, and friends).

Using an Existing Locale

Nine languages ship with the package: en, cn, de, es, fr, it, jp, pt, ru. Pair each calendar locale with the matching core locale so popups, pickers, and the editor speak the same language as the toolbar:

import { Calendar } from "@svar-ui/react-calendar";
import { Locale } from "@svar-ui/react-core";
import { de } from "@svar-ui/calendar-locales";
import { de as deCore } from "@svar-ui/core-locales";

const words = { ...de, ...deCore };

<Locale words={words}>
  <Calendar events={events} date={date} />
</Locale>

Spread both dictionaries into one words object and hand it to <Locale>. The calendar pulls its strings from the eventCalendar namespace; the core dictionary covers everything sub-widgets need.

Custom Locale

A custom locale is a partial override. Spread the default first so untouched keys keep their built-in translations, then redefine the handful you actually want to change:

import { Calendar } from "@svar-ui/react-calendar";
import { Locale } from "@svar-ui/react-core";
import { en } from "@svar-ui/calendar-locales";
import { en as enCore } from "@svar-ui/core-locales";

const words = {
  ...enCore,
  ...en,
  eventCalendar: {
    ...en.eventCalendar,
    Today: "Now",
    "Edit event": "Open event",
    "Delete event": "Remove event",
  },
};

<Locale words={words}>
  <Calendar events={events} date={date} />
</Locale>

Drop the inner spread (...en.eventCalendar) and you'll wipe every other label in the namespace. Keep the spread; override only what you need.

Custom Date Formats

Date and time format strings live in the same eventCalendar namespace. Override them the same way to match local conventions:

import { Calendar } from "@svar-ui/react-calendar";
import { Locale } from "@svar-ui/react-core";
import { en } from "@svar-ui/calendar-locales";
import { en as enCore } from "@svar-ui/core-locales";

const words = {
  ...enCore,
  ...en,
  eventCalendar: {
    ...en.eventCalendar,
    timeScaleFormat: "%H:%i",
    titleDayFormat: "%j %F %Y",
    titleMonthFormat: "%F %Y",
  },
};

<Locale words={words}>
  <Calendar events={events} date={date} />
</Locale>

Format tokens use the standard %-style mask shared across SVAR widgets: %Y year, %F month name, %j day of month, %H 24-hour, %i minutes, and so on.

Dynamic Locale Switching

<Locale> is a regular React wrapper, so words can come straight from app state. One catch: re-mount the subtree on locale change, otherwise cached date formatters keep emitting strings from the old language.

import { useState, useMemo } from "react";
import { Calendar } from "@svar-ui/react-calendar";
import { Locale, Segmented } from "@svar-ui/react-core";
import { en, de, fr } from "@svar-ui/calendar-locales";
import {
  en as enCore,
  de as deCore,
  fr as frCore,
} from "@svar-ui/core-locales";

const dictionaries = {
  en: { ...enCore, ...en },
  de: { ...deCore, ...de },
  fr: { ...frCore, ...fr },
};

const options = [
  { id: "en", label: "English" },
  { id: "de", label: "German" },
  { id: "fr", label: "French" },
];

function App() {
  const [locale, setLocale] = useState("en");
  const words = useMemo(() => dictionaries[locale], [locale]);

  return (
    <>
      <Segmented options={options} value={locale} onChange={v => setLocale(v.value)} />
      <Locale key={locale} words={words}>
        <Calendar events={events} date={date} />
      </Locale>
    </>
  );
}

The key={locale} prop forces the calendar to rebuild on every language switch. Drop it and the toolbar labels update, but the date formats stay frozen on the language you mounted with.

Locale Object Reference

Calendar locales live under the eventCalendar namespace. The keys break into two groups: UI strings and date format masks.

UI Labels

Key	Where it appears
Day, Week, Month, Agenda, Year, Resources, Timeline	View switcher entries in the toolbar
Today	"Today" button in the toolbar
Edit event, Delete event, Delete	Context-menu items and editor buttons
Text, Start date, End date, All day, Full day	Default editor field labels
Calendars, Menu, Calendar, Calendar sidebar	CalendarPanel heading and ARIA labels
Previous period, Next period, Date navigation, Calendar controls, Calendar filters	ARIA labels on toolbar and panel controls

Date and Time Formats

These format strings drive every date the calendar prints. Each value is a %-style mask.

Key	Used in
timeScaleFormat	Time-axis labels in day, week, resources, timeline views
weekScaleFormat	Day-column headers in the week view
monthScaleFormat	Day-of-week headers in the month view
weekNumberFormat	Optional week-number column
titleDayFormat	Toolbar date label in day view
titleWeekFormatStart, titleWeekFormatEnd	Toolbar range label in week view
titleMonthFormat	Toolbar date label in month and agenda views
yearMonthFormat	Mini-month captions in year view
agendaDayFormat	Day grouping headers in agenda view