diff --git a/src/core/pipes/pipes.module.ts b/src/core/pipes/pipes.module.ts
index b8b197300..a45223af7 100644
--- a/src/core/pipes/pipes.module.ts
+++ b/src/core/pipes/pipes.module.ts
@@ -22,6 +22,7 @@ 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: [
@@ -33,6 +34,7 @@ import { CoreTimeAgoPipe } from './time-ago';
         CoreNoTagsPipe,
         CoreSecondsToHMSPipe,
         CoreTimeAgoPipe,
+        CoreToLocaleStringPipe,
     ],
     exports: [
         CoreBytesToSizePipe,
@@ -43,6 +45,7 @@ import { CoreTimeAgoPipe } from './time-ago';
         CoreNoTagsPipe,
         CoreSecondsToHMSPipe,
         CoreTimeAgoPipe,
+        CoreToLocaleStringPipe,
     ],
 })
 export class CorePipesModule {}
diff --git a/src/core/pipes/to-locale-string.ts b/src/core/pipes/to-locale-string.ts
new file mode 100644
index 000000000..5783fea6c
--- /dev/null
+++ b/src/core/pipes/to-locale-string.ts
@@ -0,0 +1,67 @@
+// (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.
+ */
+@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).
+     * @return 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');
+    }
+
+}