diff --git a/apps/api/src/common/interceptors/serialize-dates.interceptor.ts b/apps/api/src/common/interceptors/serialize-dates.interceptor.ts
new file mode 100644
index 00000000..229659ed
--- /dev/null
+++ b/apps/api/src/common/interceptors/serialize-dates.interceptor.ts
@@ -0,0 +1,42 @@
+/* eslint-disable */
+import {
+  CallHandler,
+  ExecutionContext,
+  Injectable,
+  NestInterceptor,
+} from "@nestjs/common";
+import { Observable } from "rxjs";
+import { map } from "rxjs/operators";
+
+@Injectable()
+export class SerializeDatesInterceptor implements NestInterceptor {
+  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
+    return next.handle().pipe(map((data) => this.serializeDates(data)));
+  }
+
+  private serializeDates(object: any): any {
+    if (object === null || object === undefined) {
+      return object;
+    }
+
+    if (object instanceof Date) {
+      return object.toISOString();
+    }
+
+    if (Array.isArray(object)) {
+      return object.map((item) => this.serializeDates(item));
+    }
+
+    if (typeof object === "object") {
+      const serialized: any = {};
+      for (const key in object) {
+        if (object.hasOwnProperty(key)) {
+          serialized[key] = this.serializeDates(object[key]);
+        }
+      }
+      return serialized;
+    }
+
+    return object;
+  }
+}
diff --git a/apps/api/src/main.ts b/apps/api/src/main.ts
index d44e244e..3ad5eab9 100644
--- a/apps/api/src/main.ts
+++ b/apps/api/src/main.ts
@@ -27,6 +27,7 @@ import { AppModule } from "./app.module";
 import { AuthModule } from "./auth/auth.module";
 import { RolesGlobalGuard } from "./auth/role/roles.global.guard";
 import { winstonOptions } from "./logger/config";
+import { SerializeDatesInterceptor } from "./common/interceptors/serialize-dates.interceptor";
 
 if (process.env.NODE_ENV === "production") {
   instana({
@@ -103,6 +104,12 @@ async function bootstrap() {
      */
     app.useGlobalGuards(app.select(AuthModule).get(RolesGlobalGuard));
 
+    /**
+     * Global serialization interceptor
+     * Automatically serializes Date objects to ISO strings in API responses
+     */
+    app.useGlobalInterceptors(new SerializeDatesInterceptor());
+
     /**
      * Swagger API documentation setup
      * Provides interactive API documentation at /api endpoint