diff --git a/framework/core/js/src/common/Translator.tsx b/framework/core/js/src/common/Translator.tsx
index 29498fb3a5..3aee69c72d 100644
--- a/framework/core/js/src/common/Translator.tsx
+++ b/framework/core/js/src/common/Translator.tsx
@@ -1,3 +1,4 @@
+import type { Dayjs } from 'dayjs';
 import { RichMessageFormatter, mithrilRichHandler, NestedStringArray } from '@askvortsov/rich-icu-message-formatter';
 import { pluralTypeHandler, selectTypeHandler } from '@ultraq/icu-message-formatter';
 import username from './helpers/username';
@@ -88,4 +89,16 @@ export default class Translator {
 
     return id;
   }
+
+  /**
+   * Formats the time.
+   * 
+   * The format of the time will be chosen by the following order:
+   * - The format ID defined in current locale.
+   * - The provided fallback format.
+   * - DayJS default format.
+   */
+  format(time: Dayjs, id?: string, fallback?: string): string {
+    return time.format(id && (this.translations[id] ?? fallback));
+  }
 }
diff --git a/framework/core/js/src/common/index.ts b/framework/core/js/src/common/index.ts
index f3308c7dfc..c3bff0978d 100644
--- a/framework/core/js/src/common/index.ts
+++ b/framework/core/js/src/common/index.ts
@@ -10,14 +10,13 @@ import 'bootstrap/js/transition';
 import 'jquery.hotkeys/jquery.hotkeys';
 
 import relativeTime from 'dayjs/plugin/relativeTime';
+import localizedFormat from "dayjs/plugin/localizedFormat";
 
 dayjs.extend(relativeTime);
+dayjs.extend(localizedFormat);
 
 import './registry';
 
-import { customFormats } from './utils/localizedFormat';
-dayjs.extend(customFormats);
-
 import patchMithril from './utils/patchMithril';
 
 patchMithril(window);
diff --git a/framework/core/js/src/common/utils/humanTime.ts b/framework/core/js/src/common/utils/humanTime.ts
index d450c7df4c..0ecb8614be 100644
--- a/framework/core/js/src/common/utils/humanTime.ts
+++ b/framework/core/js/src/common/utils/humanTime.ts
@@ -1,3 +1,4 @@
+import app from '../app';
 import dayjs from 'dayjs';
 
 /**
@@ -21,9 +22,9 @@ export default function humanTime(time: dayjs.ConfigType): string {
   // in the string. If it wasn't this year, we'll show the year as well.
   if (d.diff(now, 'day') < -30) {
     if (d.isSame(now, 'year')) {
-      ago = d.format('f');
+      ago = app.translator.format(d, 'core.lib.datetime_formats.human_time_short');
     } else {
-      ago = d.format('ll');
+      ago = app.translator.format(d, 'core.lib.datetime_formats.human_time_full');
     }
   } else {
     ago = d.fromNow();
diff --git a/framework/core/js/src/common/utils/localizedFormat.ts b/framework/core/js/src/common/utils/localizedFormat.ts
deleted file mode 100644
index 937a578814..0000000000
--- a/framework/core/js/src/common/utils/localizedFormat.ts
+++ /dev/null
@@ -1,84 +0,0 @@
-import app from '../../common/app';
-import ItemList from './ItemList';
-
-export type LocalizedFormat = {
-  /** Regexes that matches the formats. */
-  regexes: string[];
-  /** The map that turns matched localized formats to original DayJS formats. */
-  formats: Record<string, string>
-}
-
-const defaultFormats = new ItemList<LocalizedFormat>();
-
-defaultFormats.add("flarum-date-formats", {
-  regexes: ["f{1,2}", "F{1,2}"],
-  formats: {
-    F: "DD MMMM",
-    FF: "MMMM YYYY"
-  }
-}, 10);
-
-defaultFormats.add("dayjs-formats", {
-  regexes: ["LTS?", "l{1,4}", "L{1,4}"],
-  formats: {
-    LTS: 'h:mm:ss A',
-    LT: 'h:mm A',
-    L: 'MM/DD/YYYY',
-    LL: 'MMMM D, YYYY',
-    LLL: 'MMMM D, YYYY h:mm A',
-    LLLL: 'dddd, MMMM D, YYYY h:mm A'
-  }
-}, 20);
-
-const exports = {
-  /**
-   * Returns a list of regexes that matches all localized formats and a map that maps the format to the original DayJS format.
-   */
-  formatList: function() {
-    const formats = new ItemList<LocalizedFormat>();
-    formats.merge(defaultFormats);
-    return formats;
-  }
-};
-
-/**
- * Flarum's localized format plugin.
- * @see https://day.js.org/docs/en/plugin/plugin
- */
-export const customFormats: import('dayjs').PluginFunc = function (_option, c, _factory) {
-  const proto = c.prototype;
-  const oldFormat = proto.format;
-
-  /** Converts the long date to short date. */
-  const t = (format?: string) => format?.replace(/(\[[^\]]+])|(MMMM|MM|DD|dddd)/g, (_, a, b) => a || b.slice(1));
-
-  proto.format = function (template) {
-    const { formats = {} } = (this as any).$locale();
-    
-    const config = exports.formatList().toArray();
-    const regexes: string[] = [];
-    let defFormats: Record<string, string> = {};
-    config.forEach((v) => {
-      regexes.push(...v.regexes);
-      defFormats = { ...defFormats, ...v.formats };
-    });
-    
-    const result = template?.replace(new RegExp(`(\\[[^\\]]+])|(${regexes.join("|")})`, "g"), (_, a, b) => {
-      const B = b && b.toUpperCase();
-      // The format is fetched in the following order: Translator > DayJS locale > formatList.
-      console.log(regexes, defFormats);
-      return a ||
-        // short dates
-        app.translator.translations[`core.forum.date-format.${b}`] ||
-        formats[b] ||
-        defFormats[b] ||
-        // long dates
-        t(app.translator.translations[`core.forum.date-format.${B}`]) ||
-        t(formats[B]) ||
-        t(defFormats[B]);
-    });
-    return oldFormat.call(this, result);
-  };
-};
-
-export default exports;
\ No newline at end of file
diff --git a/framework/core/js/src/forum/components/PostStream.js b/framework/core/js/src/forum/components/PostStream.js
index 78251423a4..cdb66128eb 100644
--- a/framework/core/js/src/forum/components/PostStream.js
+++ b/framework/core/js/src/forum/components/PostStream.js
@@ -270,7 +270,7 @@ export default class PostStream extends Component {
     // set the index to the last post.
     this.stream.index = indexFromViewPort !== null ? indexFromViewPort + 1 : this.stream.count();
     this.stream.visible = visible;
-    if (period) this.stream.description = dayjs(period).format('FF');
+    if (period) this.stream.description = app.translator.format(dayjs(period), 'core.lib.datetime_formats.post_stream_scrubber');
   }
 
   /**
diff --git a/framework/core/locale/core.yml b/framework/core/locale/core.yml
index edb62d0d72..4d424a8ccd 100644
--- a/framework/core/locale/core.yml
+++ b/framework/core/locale/core.yml
@@ -843,6 +843,12 @@ core:
     username:
       deleted_text: "[deleted]"
 
+    # These are DayJS formats used in core.
+    datetime_formats:
+      human_time_short: D MMM
+      human_time_full: ll
+      post_stream_scrubber: MMMM YYYY
+
   # Translations in this namespace are used in views other than Flarum's normal JS client.
   views:
     # Translations in this namespace are displayed by the basic HTML admin index.