Bugfix/start date of calendar year date ranges in portfolio performance (#8077)

* Fix start date of calendar year date ranges in portfolio performance

* Update changelog

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed the visibility of the asset class, asset sub class, fee and quantity fields of a valuable in the create activity dialog
 - Fixed the missing mapping for Aland Islands in the country weightings of the _Financial Modeling Prep_ service
 - Fixed the net performance percentage of date ranges in the portfolio performance calculation by weighting the average investment by the number of days between the chart dates
+- Fixed the start date of calendar year date ranges in the portfolio performance calculation
 
 ## 3.80.2 - 2026-10-06
 

apps/api/src/app/endpoints/benchmarks/benchmarks.service.ts

@@ -13,7 +13,7 @@ import {
 import { DateRange } from '@ghostfolio/common/types';
 
 import { Injectable, Logger } from '@nestjs/common';
-import { format, isSameDay } from 'date-fns';
+import { format, isSameDay, min } from 'date-fns';
 import { isNumber } from 'lodash-es';
 
 @Injectable()
@@ -96,8 +96,8 @@ export class BenchmarksService {
 
     const exchangeRates =
       await this.exchangeRateDataService.getExchangeRatesByCurrency({
-        startDate,
         currencies: [currentSymbolItem.currency],
+        startDate: min([baselineDate, startDate]),
         targetCurrency: userCurrency
       });
 

apps/api/src/app/portfolio/calculator/portfolio-calculator.ts

@@ -64,6 +64,7 @@ import {
   format,
   isAfter,
   isBefore,
+  isEqual,
   isFuture,
   isPast,
   isWithinInterval,
@@ -1417,10 +1418,14 @@ export abstract class PortfolioCalculator {
     let netPerformanceAtStartDate: number;
     let netPerformanceWithCurrencyEffectAtStartDate: number;
 
+    const startDate = isEqual(start, endOfDay(start))
+      ? resetHours(start)
+      : start;
+
     for (const historicalDataItem of historicalData) {
       const date = resetHours(parseDate(historicalDataItem.date));
 
-      if (!isBefore(date, start) && !isAfter(date, end)) {
+      if (!isBefore(date, startDate) && !isAfter(date, end)) {
         // Take the values at the start date from the first day of the date
         // range
         if (historicalDataItemsOfDateRange.length === 0) {

apps/api/src/app/portfolio/calculator/roai/portfolio-calculator-btcusd-buy-and-sell-partially.spec.ts

@@ -13,6 +13,7 @@ import { ExchangeRateDataService } from '@ghostfolio/api/services/exchange-rate-
 import { ExchangeRateDataServiceMock } from '@ghostfolio/api/services/exchange-rate-data/exchange-rate-data.service.mock';
 import { PortfolioSnapshotService } from '@ghostfolio/api/services/queues/portfolio-snapshot/portfolio-snapshot.service';
 import { PortfolioSnapshotServiceMock } from '@ghostfolio/api/services/queues/portfolio-snapshot/portfolio-snapshot.service.mock';
+import { getIntervalFromDateRange } from '@ghostfolio/common/calculation-helper';
 import { parseDate } from '@ghostfolio/common/helper';
 import { PerformanceCalculationType } from '@ghostfolio/common/types/performance-calculation-type.type';
 
@@ -168,6 +169,7 @@ describe('PortfolioCalculator', () => {
             },
             netPerformanceWithCurrencyEffectMap: {
               '1d': new Big('-556.443324'),
+              '2017': new Big('27081.23736'),
               max: new Big('26516.208701400000064086'),
               ytd: new Big('-556.443324')
             },
@@ -262,8 +264,8 @@ describe('PortfolioCalculator', () => {
         '2017': {
           date: '2017-12-31',
           netPerformance: 26957.033439,
-          netPerformanceInPercentage: 44.109822737327406,
+          netPerformanceInPercentage: 44.10965416175681,
-          netPerformanceInPercentageWithCurrencyEffect: 43.14859823223876,
+          netPerformanceInPercentageWithCurrencyEffect: 43.148434302822835,
           netPerformanceWithCurrencyEffect: 27081.23736,
           totalInvestmentValueWithCurrencyEffect: 318.54266729999995,
           valueWithCurrencyEffect: 13854.86868
@@ -287,6 +289,17 @@ describe('PortfolioCalculator', () => {
           valueWithCurrencyEffect: 13298.425356
         }
       });
+
+      const { endDate, startDate } = getIntervalFromDateRange({
+        dateRange: '2017'
+      });
+
+      const { chart } = await portfolioCalculator.getPerformance({
+        end: endDate,
+        start: startDate
+      });
+
+      expect(chart[0].date).toBe('2016-12-31');
     });
 
     it.only('with BTCUSD buy and sell partially and fewer chart items', async () => {
@@ -333,12 +346,12 @@ describe('PortfolioCalculator', () => {
       // Other weights give another rounding of the floating point numbers
       expect(
         performanceByDateRange['2017'].netPerformanceInPercentage
-      ).toBeCloseTo(44.109822737327406, 10);
+      ).toBeCloseTo(44.10965416175681, 10);
 
       expect(
         performanceByDateRange['2017']
           .netPerformanceInPercentageWithCurrencyEffect
-      ).toBeCloseTo(43.14859823223876, 10);
+      ).toBeCloseTo(43.148434302822835, 10);
 
       expect(performanceByDateRange.max.netPerformanceInPercentage).toBeCloseTo(
         42.43911719562077,