diff --git a/DSL/Resql/analytics/POST/chat-quality-overview.sql b/DSL/Resql/analytics/POST/chat-quality-overview.sql
index d8f06e9b..538ff5d0 100644
--- a/DSL/Resql/analytics/POST/chat-quality-overview.sql
+++ b/DSL/Resql/analytics/POST/chat-quality-overview.sql
@@ -6,7 +6,7 @@ WITH latest_per_base AS (
     ORDER BY c.base_id, c.updated DESC
 )
 SELECT
-    DATE_TRUNC(:period, lp.ended) AS time,
+    DATE_TRUNC(:period, lp.ended AT TIME ZONE :timezone) AT TIME ZONE :timezone AS time,
     COUNT(DISTINCT lp.base_id) AS total,
     COUNT(DISTINCT cm_theme.chat_base_id) AS themes,
     COUNT(DISTINCT cm_quality.chat_base_id) AS response_quality,
diff --git a/DSL/Ruuter/analytics/POST/chats/quality-overview.yml b/DSL/Ruuter/analytics/POST/chats/quality-overview.yml
index 333f7d47..209fa3f4 100644
--- a/DSL/Ruuter/analytics/POST/chats/quality-overview.yml
+++ b/DSL/Ruuter/analytics/POST/chats/quality-overview.yml
@@ -23,6 +23,9 @@ declaration:
       - field: showTest
         type: boolean
         description: "Body field 'showTest'"
+      - field: timezone
+        type: string
+        description: "Body field 'timezone'"
 
 check_for_required_parameters:
   switch:
@@ -40,6 +43,7 @@ post_chart_data:
       period: ${incoming.body.period}
       urls: ${incoming.body.urls}
       showTest: ${incoming.body.showTest}
+      timezone: ${incoming.body.timezone}
   result: chart_result
 
 assign_chart_data:
diff --git a/GUI/src/pages/ChatsPage/index.tsx b/GUI/src/pages/ChatsPage/index.tsx
index addd5f4d..3b5570e1 100644
--- a/GUI/src/pages/ChatsPage/index.tsx
+++ b/GUI/src/pages/ChatsPage/index.tsx
@@ -338,7 +338,7 @@ const ChatsPage: React.FC = () => {
     let result: ChartData = { chartData: [], colors: [] };
     try {
       const response = await request<
-        Readonly<{ start_date: string; end_date: string; period: string; urls: (string | null)[]; showTest: boolean }>,
+        Readonly<{ start_date: string; end_date: string; period: string; urls: (string | null)[]; showTest: boolean; timezone: string }>,
         {
           response: [
             { time: string; total: number; themes: number; responseQuality: number; followUp: number }[],
@@ -361,6 +361,7 @@ const ChatsPage: React.FC = () => {
           period: config.groupByPeriod || 'day',
           urls: getDomainsArray(),
           showTest: getShowTestData(),
+          timezone: Intl.DateTimeFormat().resolvedOptions().timeZone,
         },
       });
       const chartRows = response.response[0] ?? [];