diff --git a/apps/api/src/app/activities/activities.controller.ts b/apps/api/src/app/activities/activities.controller.ts
index 81af257456..589ae48a2c 100644
--- a/apps/api/src/app/activities/activities.controller.ts
+++ b/apps/api/src/app/activities/activities.controller.ts
@@ -83,7 +83,7 @@ export class ActivitiesController {
       filterByTags
     });
 
-    const types = (filterByTypes?.split(',') as ActivityType[]) ?? [];
+    const types = this.parseActivityTypes(filterByTypes);
 
     return this.activitiesService.deleteActivities({
       endDate,
@@ -152,7 +152,7 @@ export class ActivitiesController {
     const impersonationUserId =
       await this.impersonationService.validateImpersonationId(impersonationId);
 
-    const types = (filterByTypes?.split(',') as ActivityType[]) ?? [];
+    const types = this.parseActivityTypes(filterByTypes);
 
     const userCurrency = this.request.user.settings.settings.baseCurrency;
 
@@ -360,4 +360,28 @@ export class ActivitiesController {
       }
     });
   }
+
+  private parseActivityTypes(filterByTypes?: string): ActivityType[] {
+    if (!filterByTypes) {
+      return [];
+    }
+
+    const types = filterByTypes.split(',');
+
+    const invalidTypes = types.filter((type) => {
+      return !Object.values(ActivityType).includes(type as ActivityType);
+    });
+
+    if (invalidTypes.length > 0) {
+      throw new HttpException(
+        {
+          error: getReasonPhrase(StatusCodes.BAD_REQUEST),
+          message: [`Invalid activity type: ${invalidTypes.join(', ')}`]
+        },
+        StatusCodes.BAD_REQUEST
+      );
+    }
+
+    return types as ActivityType[];
+  }
 }
diff --git a/apps/client/src/app/pages/portfolio/activities/activities-page.component.ts b/apps/client/src/app/pages/portfolio/activities/activities-page.component.ts
index da0570142e..21704ffaf7 100644
--- a/apps/client/src/app/pages/portfolio/activities/activities-page.component.ts
+++ b/apps/client/src/app/pages/portfolio/activities/activities-page.component.ts
@@ -120,11 +120,11 @@ export class GfActivitiesPageComponent implements OnInit {
   protected onDeleteActivities() {
     this.dataService
       .deleteActivities({
-        range: this.getCalendarYearRange(),
         activityTypes: this.activityTypesFilter.length
           ? this.activityTypesFilter
           : undefined,
-        filters: this.userService.getFilters()
+        filters: this.userService.getFilters(),
+        range: this.getCalendarYearRange()
       })
       .pipe(takeUntilDestroyed(this.destroyRef))
       .subscribe(() => {
@@ -283,11 +283,11 @@ export class GfActivitiesPageComponent implements OnInit {
 
     this.dataService
       .fetchActivities({
-        range: this.getCalendarYearRange(),
         activityTypes: this.activityTypesFilter.length
           ? this.activityTypesFilter
           : undefined,
         filters: this.userService.getFilters(),
+        range: this.getCalendarYearRange(),
         skip: this.pageIndex * this.pageSize,
         sortColumn: this.sortColumn,
         sortDirection: this.sortDirection,
diff --git a/libs/common/src/lib/calculation-helper.ts b/libs/common/src/lib/calculation-helper.ts
index 2097fa52ac..8fceea828b 100644
--- a/libs/common/src/lib/calculation-helper.ts
+++ b/libs/common/src/lib/calculation-helper.ts
@@ -1,3 +1,4 @@
+import { UTCDate } from '@date-fns/utc';
 import { Big } from 'big.js';
 import {
   endOfDay,
@@ -7,6 +8,7 @@ import {
   startOfWeek,
   startOfYear,
   subDays,
+  subMilliseconds,
   subYears
 } from 'date-fns';
 import { isFinite, isNumber } from 'lodash';
@@ -75,10 +77,20 @@ export function getIntervalFromDateRange(params: {
       break;
     case 'max':
       break;
-    default:
+    default: {
       // '2024', '2023', '2022', etc.
-      endDate = endOfYear(new Date(dateRange));
-      startDate = max([startDate, new Date(dateRange)]);
+      const yearStartDate = new UTCDate(`${dateRange}-01-01`);
+
+      // Derive the boundaries of the calendar year in UTC to be independent of
+      // the server's time zone, but hand out plain dates as the consumers apply
+      // local time zone semantics. As the start date is exclusive, the last
+      // millisecond of the preceding year is used.
+      endDate = new Date(endOfYear(yearStartDate).getTime());
+      startDate = max([
+        startDate,
+        new Date(subMilliseconds(yearStartDate, 1).getTime())
+      ]);
+    }
   }
 
   return { endDate, startDate };