diff --git a/app/performance_platform/total_sent_notifications.py b/app/performance_platform/total_sent_notifications.py
index 6dc1d039a..324010015 100644
--- a/app/performance_platform/total_sent_notifications.py
+++ b/app/performance_platform/total_sent_notifications.py
@@ -1,5 +1,6 @@
 from app import performance_platform_client
 from app.dao.fact_notification_status_dao import get_total_sent_notifications_for_day_and_type
+from app.utils import get_london_midnight_in_utc
 
 
 def send_total_notifications_sent_for_day_stats(date, notification_type, count):
@@ -19,8 +20,10 @@ def get_total_sent_notifications_for_day(day):
     sms_count = get_total_sent_notifications_for_day_and_type(day, 'sms')
     letter_count = get_total_sent_notifications_for_day_and_type(day, 'letter')
 
+    start_date = get_london_midnight_in_utc(day)
+
     return {
-        "start_date": day,
+        "start_date": start_date,
         "email": {
             "count": email_count
         },
diff --git a/tests/app/performance_platform/test_total_sent_notifications.py b/tests/app/performance_platform/test_total_sent_notifications.py
index 0945903cc..c291a3794 100644
--- a/tests/app/performance_platform/test_total_sent_notifications.py
+++ b/tests/app/performance_platform/test_total_sent_notifications.py
@@ -53,15 +53,11 @@ def test_get_total_sent_notifications_yesterday_returns_expected_totals_dict(sam
 
     total_count_dict = get_total_sent_notifications_for_day(yesterday)
 
-    assert total_count_dict == {
-        "start_date": yesterday,
-        "email": {
-            "count": 3
-        },
-        "sms": {
-            "count": 2
-        },
-        "letter": {
-            "count": 1
-        }
-    }
+    assert total_count_dict["email"] == {"count": 3}
+    assert total_count_dict["sms"] == {"count": 2}
+    assert total_count_dict["letter"] == {"count": 1}
+
+    # Should return a time around midnight depending on timezones
+    expected_start = datetime.combine(yesterday, datetime.min.time())
+    time_diff = abs(expected_start - total_count_dict["start_date"])
+    assert time_diff <= timedelta(minutes=60)