diff --git a/apps/api/src/app/portfolio/portfolio.service.ts b/apps/api/src/app/portfolio/portfolio.service.ts
index d04181398..24d760888 100644
--- a/apps/api/src/app/portfolio/portfolio.service.ts
+++ b/apps/api/src/app/portfolio/portfolio.service.ts
@@ -951,6 +951,7 @@ export class PortfolioService {
 
     return {
       activitiesCount,
+      dateOfFirstActivity,
       marketPrice,
       marketPriceMax,
       marketPriceMin,
@@ -958,7 +959,6 @@ export class PortfolioService {
       tags,
       averagePrice: averagePrice.toNumber(),
       dataProviderInfo: portfolioCalculator.getDataProviderInfos()?.[0],
-      dateOfFirstActivity: parseISO(dateOfFirstActivity),
       dividendInBaseCurrency: dividendInBaseCurrency.toNumber(),
       dividendYieldPercent: dividendYieldPercent.toNumber(),
       dividendYieldPercentWithCurrencyEffect:
diff --git a/libs/common/src/lib/interfaces/responses/portfolio-holding-response.interface.ts b/libs/common/src/lib/interfaces/responses/portfolio-holding-response.interface.ts
index e50037d3e..76bc7dc02 100644
--- a/libs/common/src/lib/interfaces/responses/portfolio-holding-response.interface.ts
+++ b/libs/common/src/lib/interfaces/responses/portfolio-holding-response.interface.ts
@@ -11,7 +11,7 @@ export interface PortfolioHoldingResponse {
   activitiesCount: number;
   averagePrice: number;
   dataProviderInfo: DataProviderInfo;
-  dateOfFirstActivity: Date;
+  dateOfFirstActivity: string;
   dividendInBaseCurrency: number;
   dividendYieldPercent: number;
   dividendYieldPercentWithCurrencyEffect: number;
diff --git a/libs/ui/src/lib/services/data.service.ts b/libs/ui/src/lib/services/data.service.ts
index 9257c88eb..4f3546579 100644
--- a/libs/ui/src/lib/services/data.service.ts
+++ b/libs/ui/src/lib/services/data.service.ts
@@ -445,19 +445,21 @@ export class DataService {
   }: {
     dataSource: DataSource;
     symbol: string;
-  }) {
+  }): Observable<
+    Omit<PortfolioHoldingResponse, 'dateOfFirstActivity'> & {
+      dateOfFirstActivity: Date;
+    }
+  > {
     return this.http
       .get<PortfolioHoldingResponse>(
         `/api/v1/portfolio/holding/${dataSource}/${symbol}`
       )
       .pipe(
         map((response) => {
-          if (response.dateOfFirstActivity) {
-            response.dateOfFirstActivity = parseISO(
-              response.dateOfFirstActivity as unknown as string
-            );
-          }
-          return response;
+          return {
+            ...response,
+            dateOfFirstActivity: parseISO(response.dateOfFirstActivity)
+          };
         })
       );
   }