1 files changed, 69 insertions, 0 deletions
diff --git a/src/components/hooks/dates.ts b/src/components/hooks/dates.ts
new file mode 100644
index 000000000..b0f94133b
--- /dev/null
+++ b/src/components/hooks/dates.ts
@@ -0,0 +1,69 @@
+/**
+ * Hooks for date-fns localized formatters.
+ *
+ * Our app supports some languages that are not included in date-fns by
+ * default, in which case it will fall back to English.
+ *
+ * {@link https://github.com/date-fns/date-fns/blob/main/docs/i18n.md}
+ */
+
+import React from 'react'
+import {formatDistance, Locale} from 'date-fns'
+import {
+  ca,
+  de,
+  es,
+  fi,
+  fr,
+  hi,
+  id,
+  it,
+  ja,
+  ko,
+  ptBR,
+  tr,
+  uk,
+  zhCN,
+  zhTW,
+} from 'date-fns/locale'
+
+import {AppLanguage} from '#/locale/languages'
+import {useLanguagePrefs} from '#/state/preferences'
+
+/**
+ * {@link AppLanguage}
+ */
+const locales: Record<AppLanguage, Locale | undefined> = {
+  en: undefined,
+  ca,
+  de,
+  es,
+  fi,
+  fr,
+  ga: undefined,
+  hi,
+  id,
+  it,
+  ja,
+  ko,
+  ['pt-BR']: ptBR,
+  tr,
+  uk,
+  ['zh-CN']: zhCN,
+  ['zh-TW']: zhTW,
+}
+
+/**
+ * Returns a localized `formatDistance` function.
+ * {@link formatDistance}
+ */
+export function useFormatDistance() {
+  const {appLanguage} = useLanguagePrefs()
+  return React.useCallback<typeof formatDistance>(
+    (date, baseDate, options) => {
+      const locale = locales[appLanguage as AppLanguage]
+      return formatDistance(date, baseDate, {...options, locale: locale})
+    },
+    [appLanguage],
+  )
+}