diff --git a/package-lock.json b/package-lock.json
index 55d77a3b..326deff6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -15,6 +15,7 @@
         "@vueuse/core": "^9.13.0",
         "@vueuse/nuxt": "^9.13.0",
         "csv": "^6.2.7",
+        "date-fns-tz": "^3.1.3",
         "floating-vue": "^2.0.0-beta.20",
         "husky": "^8.0.3",
         "jiti": "^1.18.2",
@@ -6369,6 +6370,26 @@
         "node": ">=0.10"
       }
     },
+    "node_modules/date-fns": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-3.6.0.tgz",
+      "integrity": "sha512-fRHTG8g/Gif+kSh50gaGEdToemgfj74aRX3swtiouboip5JDLAyDE9F11nHMIcvOaXeOC6D7SpNhi7uFyB7Uww==",
+      "license": "MIT",
+      "peer": true,
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/kossnocorp"
+      }
+    },
+    "node_modules/date-fns-tz": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/date-fns-tz/-/date-fns-tz-3.1.3.tgz",
+      "integrity": "sha512-ZfbMu+nbzW0mEzC8VZrLiSWvUIaI3aRHeq33mTe7Y38UctKukgqPR4nTDwcwS4d64Gf8GghnVsroBuMY3eiTeA==",
+      "license": "MIT",
+      "peerDependencies": {
+        "date-fns": "^3.0.0"
+      }
+    },
     "node_modules/dayjs": {
       "version": "1.11.9",
       "resolved": "https://registry.npmjs.org/dayjs/-/dayjs-1.11.9.tgz",
diff --git a/package.json b/package.json
index 8661bf06..85464e7c 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
     "@vueuse/core": "^9.13.0",
     "@vueuse/nuxt": "^9.13.0",
     "csv": "^6.2.7",
+    "date-fns-tz": "^3.1.3",
     "floating-vue": "^2.0.0-beta.20",
     "husky": "^8.0.3",
     "jiti": "^1.18.2",
diff --git a/src/server/api/consume-opening-hours.ts b/src/server/api/consume-opening-hours.ts
index 5acf894e..31e8cdb1 100644
--- a/src/server/api/consume-opening-hours.ts
+++ b/src/server/api/consume-opening-hours.ts
@@ -1,8 +1,11 @@
+import { fromZonedTime } from 'date-fns-tz';
 import { Client } from '@microsoft/microsoft-graph-client';
 import { ClientSecretCredential } from '@azure/identity';
 import { TokenCredentialAuthenticationProvider } from '@microsoft/microsoft-graph-client/authProviders/azureTokenCredentials/index.js';
 import { serverSupabaseServiceRole } from '#supabase/server';
 
+const timezone = 'Europe/Amsterdam';
+
 const { internalSecret, datoApiToken, microsoftGraph } = useRuntimeConfig();
 
 const credential = new ClientSecretCredential(
@@ -18,7 +21,7 @@ const authProvider = new TokenCredentialAuthenticationProvider(credential, {
 const graphClient = Client.initWithMiddleware({
   authProvider: authProvider,
   fetchOptions: {
-    headers: { 'Prefer': 'outlook.timezone="Europe/Amsterdam"' },
+    headers: { 'Prefer': `outlook.timezone="${timezone}"` },
   },
 });
 
@@ -83,15 +86,18 @@ export default defineEventHandler(async (event) => {
           }&$select=subject,start,end`
         )
         .get()
-        .then((calendarView) => ({
-          number: building.number,
-          openEvents: calendarView.value
-            .filter((event: CalendarEvent) => event.subject === 'Open')
-            .map((event: CalendarEvent) => ({
-              start: new Date(event.start.dateTime).toISOString(),
-              end: new Date(event.end.dateTime).toISOString(),
-            })),
-        }))
+        .then((calendarView) => {
+          console.info(`Fetched opening hours of ${buildingsOpeningDates.length} buildings`);
+          return {
+            number: building.number,
+            openEvents: calendarView.value
+              .filter((event: CalendarEvent) => event.subject === 'Open')
+              .map((event: CalendarEvent) => ({
+                start: fromZonedTime(event.start.dateTime, timezone).toISOString(),
+                end: fromZonedTime(event.end.dateTime, timezone).toISOString(),
+              })),
+          }
+        })
         .catch((error) => {
           console.warn(
             `Failed to fetch data for building ${building.number}:`,