diff --git a/src/core/pipes/pipes.module.ts b/src/core/pipes/pipes.module.ts
index a7783dbd7..b8b197300 100644
--- a/src/core/pipes/pipes.module.ts
+++ b/src/core/pipes/pipes.module.ts
@@ -22,7 +22,6 @@ import { CoreFormatDatePipe } from './format-date';
 import { CoreNoTagsPipe } from './no-tags';
 import { CoreSecondsToHMSPipe } from './seconds-to-hms';
 import { CoreTimeAgoPipe } from './time-ago';
-import { CoreToLocaleStringPipe } from './to-locale-string';
 
 @NgModule({
     declarations: [
@@ -34,8 +33,6 @@ import { CoreToLocaleStringPipe } from './to-locale-string';
         CoreNoTagsPipe,
         CoreSecondsToHMSPipe,
         CoreTimeAgoPipe,
-        // eslint-disable-next-line deprecation/deprecation
-        CoreToLocaleStringPipe,
     ],
     exports: [
         CoreBytesToSizePipe,
@@ -46,8 +43,6 @@ import { CoreToLocaleStringPipe } from './to-locale-string';
         CoreNoTagsPipe,
         CoreSecondsToHMSPipe,
         CoreTimeAgoPipe,
-        // eslint-disable-next-line deprecation/deprecation
-        CoreToLocaleStringPipe,
     ],
 })
 export class CorePipesModule {}
diff --git a/src/core/pipes/to-locale-string.ts b/src/core/pipes/to-locale-string.ts
deleted file mode 100644
index 7159f70a4..000000000
--- a/src/core/pipes/to-locale-string.ts
+++ /dev/null
@@ -1,68 +0,0 @@
-// (C) Copyright 2015 Moodle Pty Ltd.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-import { Pipe, PipeTransform } from '@angular/core';
-import { CoreTimeUtils } from '@services/utils/time';
-
-import { CoreLogger } from '@singletons/logger';
-
-/**
- * Filter to format a timestamp to a locale string. Timestamp can be in seconds or milliseconds.
- *
- * @deprecated since 3.6. Use coreFormatDate instead.
- * This pipe wasn't removed in app 4.0 because some site plugins still used it. It will be removed in future versions
- * (see MOBILE-2823).
- */
-@Pipe({
-    name: 'coreToLocaleString',
-})
-export class CoreToLocaleStringPipe implements PipeTransform {
-
-    protected logger: CoreLogger;
-
-    constructor() {
-        this.logger = CoreLogger.getInstance('CoreToLocaleStringPipe');
-    }
-
-    /**
-     * Format a timestamp to a locale string.
-     *
-     * @param timestamp The timestamp (can be in seconds or milliseconds).
-     * @returns Formatted time.
-     */
-    transform(timestamp: number | string): string {
-        if (typeof timestamp == 'string') {
-            // Convert the value to a number.
-            const numberTimestamp = parseInt(timestamp, 10);
-            if (isNaN(numberTimestamp)) {
-                this.logger.error('Invalid value received', timestamp);
-
-                return timestamp;
-            }
-            timestamp = numberTimestamp;
-        }
-
-        if (timestamp < 0) {
-            // Date not valid.
-            return '';
-        }
-        if (timestamp < 100000000000) {
-            // Timestamp is in seconds, convert it to milliseconds.
-            timestamp = timestamp * 1000;
-        }
-
-        return CoreTimeUtils.userDate(timestamp, 'core.strftimedatetimeshort');
-    }
-
-}
diff --git a/upgrade.txt b/upgrade.txt
index 84f9ca6f9..b574fc614 100644
--- a/upgrade.txt
+++ b/upgrade.txt
@@ -4,12 +4,10 @@ For more information about upgrading, read the official documentation: https://m
 
 === 4.4.0 ===
 
-- Starting with this release, this file will only document breaking changes for APIs exposed to site plugins. Internal changes will no longer be documented.
-- CoreCache has been deprecated, use plain object as in-memory stores instead.
-
-=== 4.4.0 ===
-
+ - Starting with this release, this file will only document breaking changes for APIs exposed to site plugins. Internal changes will no longer be documented.
+ - CoreCache has been deprecated, use plain object as in-memory stores instead.
  - Renamed CoreLoginSitesComponent to CoreLoginSitesModalComponent to make it clear that it's a modal and to avoid confusing it with the new CoreSitesListComponent.
+ - Removed CoreToLocaleStringPipe deprecated since 3.6.0
 
 === 4.3.0 ===