diff --git a/app/__init__.py b/app/__init__.py
index 9c2aa28..358544e 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -1,7 +1,10 @@
+from datetime import datetime, timezone, timedelta
 from flask import Flask
 from app.config import Config
 from app.db import init_db, close_db
 
+SYDNEY_TZ = timezone(timedelta(hours=11))
+
 
 def create_app():
     app = Flask(__name__)
@@ -11,6 +14,15 @@ def create_app():
     init_db(app)
     app.teardown_appcontext(close_db)
 
+    # Jinja2 filter: convert UTC to Sydney time
+    @app.template_filter('sydney')
+    def sydney_time_filter(dt, fmt='%d %b %Y, %H:%M'):
+        if dt is None:
+            return ''
+        if dt.tzinfo is None:
+            dt = dt.replace(tzinfo=timezone.utc)
+        return dt.astimezone(SYDNEY_TZ).strftime(fmt)
+
     # Register blueprints
     from app.routes.auth import bp as auth_bp
     from app.routes.dashboard import bp as dashboard_bp
diff --git a/app/routes/api.py b/app/routes/api.py
index a4436e5..d415d4a 100644
--- a/app/routes/api.py
+++ b/app/routes/api.py
@@ -1,6 +1,8 @@
 from flask import Blueprint, jsonify
+from app import SYDNEY_TZ
 from app.auth import login_required
 from app.db import query
+from datetime import timezone
 
 bp = Blueprint("api", __name__, url_prefix="/api")
 
@@ -16,7 +18,7 @@ def chart_data(user_id):
         (user_id,),
     )
 
-    labels = [c["checked_in_at"].strftime("%d %b") for c in checkins]
+    labels = [c["checked_in_at"].replace(tzinfo=timezone.utc).astimezone(SYDNEY_TZ).strftime("%d %b") for c in checkins]
     weights = [float(c["weight_kg"]) for c in checkins]
     bmis = [float(c["bmi"]) if c["bmi"] else None for c in checkins]
 
@@ -88,7 +90,7 @@ def weekly_change(user_id):
         prev_w = float(checkins[i - 1]["weight_kg"])
         curr_w = float(checkins[i]["weight_kg"])
         change = round(curr_w - prev_w, 1)
-        label = checkins[i]["checked_in_at"].strftime("%d %b")
+        label = checkins[i]["checked_in_at"].replace(tzinfo=timezone.utc).astimezone(SYDNEY_TZ).strftime("%d %b")
         labels.append(label)
         changes.append(change)
 
diff --git a/app/templates/dashboard.html b/app/templates/dashboard.html
index 9316909..0db53f6 100644
--- a/app/templates/dashboard.html
+++ b/app/templates/dashboard.html
@@ -75,7 +75,7 @@
                     <div style="font-weight: 600; font-size: 1.1rem;">{{ '%.1f' % (c.weight_kg | float) }} kg</div>
                     <div class="activity-detail">
                         {% if c.bmi %}BMI {{ '%.1f' % (c.bmi | float) }} · {% endif %}
-                        {{ c.checked_in_at.strftime('%d %b %Y, %H:%M') }}
+                        {{ c.checked_in_at | sydney }}
                     </div>
                 </div>
             </div>
@@ -131,7 +131,7 @@
                     <div class="activity-content">
                         <div class="activity-name">{{ a.display_name or a.username }}</div>
                         <div class="activity-detail">Logged {{ '%.1f' % (a.weight_kg | float) }} kg · {{
-                            a.checked_in_at.strftime('%d %b, %H:%M') }}</div>
+                            a.checked_in_at | sydney('%d %b, %H:%M') }}</div>
                     </div>
                 </div>
                 {% endfor %}
diff --git a/app/templates/partials/checkin_row.html b/app/templates/partials/checkin_row.html
index 66af818..de60576 100644
--- a/app/templates/partials/checkin_row.html
+++ b/app/templates/partials/checkin_row.html
@@ -1,5 +1,5 @@
 <tr id="checkin-{{ c.id }}">
-    <td>{{ c.checked_in_at.strftime('%d %b %Y, %H:%M') }}</td>
+    <td>{{ c.checked_in_at | sydney }}</td>
     <td style="font-weight: 600;">{{ '%.1f' % (c.weight_kg | float) }} kg</td>
     <td>{{ '%.1f' % (c.bmi | float) if c.bmi else '—' }}</td>
     <td>{{ c.notes or '—' }}</td>