diff --git a/apps/api/jest-environment-tz.js b/apps/api/jest-environment-tz.js
new file mode 100644
index 000000000..ed05fec44
--- /dev/null
+++ b/apps/api/jest-environment-tz.js
@@ -0,0 +1,30 @@
+const NodeEnvironment = require('jest-environment-node').TestEnvironment;
+
+// Jest gives each test file a copy of `process`, so a test cannot change the
+// time zone at run time. This environment sets `TZ` on the real process of the
+// worker, which resets the internal date cache of Node.
+class TimeZoneEnvironment extends NodeEnvironment {
+  constructor(config, context) {
+    super(config, context);
+
+    this.timeZone = config.projectConfig.testEnvironmentOptions?.timeZone;
+  }
+
+  async setup() {
+    this.previousTimeZone = process.env.TZ;
+
+    if (this.timeZone) {
+      process.env.TZ = this.timeZone;
+    }
+
+    await super.setup();
+  }
+
+  async teardown() {
+    await super.teardown();
+
+    process.env.TZ = this.previousTimeZone;
+  }
+}
+
+module.exports = TimeZoneEnvironment;
diff --git a/apps/api/src/services/queues/data-gathering/data-gathering.processor.time-zone.spec.ts b/apps/api/src/services/queues/data-gathering/data-gathering.processor.time-zone.spec.ts
new file mode 100644
index 000000000..2d65b7384
--- /dev/null
+++ b/apps/api/src/services/queues/data-gathering/data-gathering.processor.time-zone.spec.ts
@@ -0,0 +1,70 @@
+/**
+ * @jest-environment <rootDir>/jest-environment-tz.js
+ * @jest-environment-options {"timeZone": "America/New_York"}
+ */
+import { DataGatheringItem } from '@ghostfolio/api/services/interfaces/interfaces';
+import { parseDate } from '@ghostfolio/common/helper';
+
+import { Job } from 'bull';
+
+import { DataGatheringProcessor } from './data-gathering.processor';
+
+describe('DataGatheringProcessor in a time zone behind UTC', () => {
+  let dataGatheringProcessor: DataGatheringProcessor;
+  let dataProviderService: { getHistoricalRaw: jest.Mock };
+  let marketDataService: { replaceForSymbol: jest.Mock; updateMany: jest.Mock };
+
+  beforeAll(() => {
+    // 2026-08-23 21:30 in New York, but already 2026-08-24 in UTC
+    jest.useFakeTimers().setSystemTime(new Date('2026-08-24T01:30:00.000Z'));
+  });
+
+  beforeEach(() => {
+    dataProviderService = {
+      getHistoricalRaw: jest.fn().mockResolvedValue({
+        'COINGECKO-bitcoin': {
+          '2026-08-21': { marketPrice: 5 },
+          '2026-08-22': { marketPrice: 6 },
+          '2026-08-23': { marketPrice: 7 }
+        }
+      })
+    };
+    marketDataService = {
+      replaceForSymbol: jest.fn(),
+      updateMany: jest.fn()
+    };
+
+    dataGatheringProcessor = new DataGatheringProcessor(
+      null,
+      dataProviderService as any,
+      marketDataService as any,
+      null
+    );
+  });
+
+  afterAll(() => {
+    jest.useRealTimers();
+  });
+
+  it('gathers up to the last complete UTC day', async () => {
+    await dataGatheringProcessor.gatherHistoricalMarketData({
+      data: {
+        dataSource: 'COINGECKO',
+        symbol: 'bitcoin',
+        date: parseDate('2026-08-21').toISOString()
+      }
+    } as unknown as Job<DataGatheringItem>);
+
+    const { data } = marketDataService.updateMany.mock.calls[0][0];
+
+    expect(
+      data.map(({ date }) => {
+        return date;
+      })
+    ).toEqual([
+      new Date('2026-08-21T00:00:00.000Z'),
+      new Date('2026-08-22T00:00:00.000Z'),
+      new Date('2026-08-23T00:00:00.000Z')
+    ]);
+  });
+});
diff --git a/apps/api/src/services/queues/data-gathering/data-gathering.service.spec.ts b/apps/api/src/services/queues/data-gathering/data-gathering.service.spec.ts
index b0e8faa81..69d98c052 100644
--- a/apps/api/src/services/queues/data-gathering/data-gathering.service.spec.ts
+++ b/apps/api/src/services/queues/data-gathering/data-gathering.service.spec.ts
@@ -60,6 +60,54 @@ describe('DataGatheringService', () => {
       );
     });
 
+    it('includes the Friday close when it runs on Saturday', async () => {
+      jest.useFakeTimers().setSystemTime(new Date('2026-08-22T14:00:00.000Z'));
+
+      await dataGatheringService[
+        'getAssetProfileIdentifiersWithRecentMarketData'
+      ]();
+
+      expect(prismaService.marketData.groupBy).toHaveBeenCalledWith(
+        expect.objectContaining({
+          where: expect.objectContaining({
+            date: { gte: new Date('2026-08-21T00:00:00.000Z') }
+          })
+        })
+      );
+    });
+
+    it('excludes the Friday close when it runs on Sunday', async () => {
+      jest.useFakeTimers().setSystemTime(new Date('2026-08-23T14:00:00.000Z'));
+
+      await dataGatheringService[
+        'getAssetProfileIdentifiersWithRecentMarketData'
+      ]();
+
+      expect(prismaService.marketData.groupBy).toHaveBeenCalledWith(
+        expect.objectContaining({
+          where: expect.objectContaining({
+            date: { gte: new Date('2026-08-22T00:00:00.000Z') }
+          })
+        })
+      );
+    });
+
+    it('excludes the Friday close when it runs on Monday', async () => {
+      jest.useFakeTimers().setSystemTime(new Date('2026-08-24T14:00:00.000Z'));
+
+      await dataGatheringService[
+        'getAssetProfileIdentifiersWithRecentMarketData'
+      ]();
+
+      expect(prismaService.marketData.groupBy).toHaveBeenCalledWith(
+        expect.objectContaining({
+          where: expect.objectContaining({
+            date: { gte: new Date('2026-08-23T00:00:00.000Z') }
+          })
+        })
+      );
+    });
+
     it('maps the query result to asset profile identifiers', async () => {
       prismaService.marketData.groupBy.mockResolvedValue([
         { dataSource: 'COINGECKO', symbol: 'bitcoin' },