diff --git a/src/core/features/user/pages/about/about.ts b/src/core/features/user/pages/about/about.ts
index 64671bcccf9..5960629d36d 100644
--- a/src/core/features/user/pages/about/about.ts
+++ b/src/core/features/user/pages/about/about.ts
@@ -120,11 +120,7 @@ export class CoreUserAboutPage implements OnInit, OnDestroy {
 
             this.user.address = CoreUserHelper.formatAddress('', user.city, user.country);
 
-            const serverTimezone = CoreSites.getCurrentSite()?.getStoredConfig('timezone');
-            this.displayTimezone = !!serverTimezone;
-            if (this.displayTimezone && this.user.timezone === USER_PROFILE_SERVER_TIMEZONE) {
-                this.user.timezone = serverTimezone;
-            }
+            this.fillTimezone();
 
             await this.checkUserImageUpdated();
         } catch (error) {
@@ -261,6 +257,30 @@ export class CoreUserAboutPage implements OnInit, OnDestroy {
         return avatarUrl;
     }
 
+    /**
+     * Fill user timezone depending on the server and fix the legacy timezones.
+     */
+    protected fillTimezone(): void {
+        if (!this.user) {
+            return;
+        }
+
+        const serverTimezone = CoreSites.getCurrentSite()?.getStoredConfig('timezone');
+        this.displayTimezone = !!serverTimezone;
+
+        if (!this.displayTimezone) {
+            return;
+        }
+
+        if (this.user.timezone === USER_PROFILE_SERVER_TIMEZONE) {
+            this.user.timezone = serverTimezone;
+        }
+
+        if (this.user.timezone) {
+            this.user.timezone = this.getLegacyTimezone(this.user.timezone);
+        }
+    }
+
     /**
      * Open a user interest.
      *
@@ -279,4 +299,72 @@ export class CoreUserAboutPage implements OnInit, OnDestroy {
         this.obsProfileRefreshed?.off();
     }
 
+    /**
+     * Translates legacy timezone names.
+     *
+     * @param tz Timezone name.
+     * @returns Readable timezone name.
+     */
+    protected getLegacyTimezone(tz: string): string {
+        const legacyTzs = {
+            '': 'Australia/Perth', // Fallback on default timezone.
+            '-13.0': 'Australia/Perth', // Fallback on default timezone.
+            '-12.5': 'Etc/GMT+12',
+            '-12.0': 'Etc/GMT+12',
+            '-11.5': 'Etc/GMT+11',
+            '-11.0': 'Etc/GMT+11',
+            '-10.5': 'Etc/GMT+10',
+            '-10.0': 'Etc/GMT+10',
+            '-9.5': 'Etc/GMT+9',
+            '-9.0': 'Etc/GMT+9',
+            '-8.5': 'Etc/GMT+8',
+            '-8.0': 'Etc/GMT+8',
+            '-7.5': 'Etc/GMT+7',
+            '-7.0': 'Etc/GMT+7',
+            '-6.5': 'Etc/GMT+6',
+            '-6.0': 'Etc/GMT+6',
+            '-5.5': 'Etc/GMT+5',
+            '-5.0': 'Etc/GMT+5',
+            '-4.5': 'Etc/GMT+4',
+            '-4.0': 'Etc/GMT+4',
+            '-3.5': 'Etc/GMT+3',
+            '-3.0': 'Etc/GMT+3',
+            '-2.5': 'Etc/GMT+2',
+            '-2.0': 'Etc/GMT+2',
+            '-1.5': 'Etc/GMT+1',
+            '-1.0': 'Etc/GMT+1',
+            '-0.5': 'Etc/GMT',
+            '0': 'Etc/GMT',
+            '0.0': 'Etc/GMT',
+            '0.5': 'Etc/GMT',
+            '1.0': 'Etc/GMT-1',
+            '1.5': 'Etc/GMT-1',
+            '2.0': 'Etc/GMT-2',
+            '2.5': 'Etc/GMT-2',
+            '3.0': 'Etc/GMT-3',
+            '3.5': 'Etc/GMT-3',
+            '4.0': 'Etc/GMT-4',
+            '4.5': 'Asia/Kabul',
+            '5.0': 'Etc/GMT-5',
+            '5.5': 'Asia/Kolkata',
+            '6.0': 'Etc/GMT-6',
+            '6.5': 'Asia/Rangoon',
+            '7.0': 'Etc/GMT-7',
+            '7.5': 'Etc/GMT-7',
+            '8.0': 'Etc/GMT-8',
+            '8.5': 'Etc/GMT-8',
+            '9.0': 'Etc/GMT-9',
+            '9.5': 'Australia/Darwin',
+            '10.0': 'Etc/GMT-10',
+            '10.5': 'Etc/GMT-10',
+            '11.0': 'Etc/GMT-11',
+            '11.5': 'Etc/GMT-11',
+            '12.0': 'Etc/GMT-12',
+            '12.5': 'Etc/GMT-12',
+            '13.0': 'Etc/GMT-13',
+        };
+
+        return legacyTzs[tz] ?? tz;
+    }
+
 }