From 8c585169d048da6c2084b00ea279af0308ea265f Mon Sep 17 00:00:00 2001
From: Marcel Arndt <marcel.arndt@hotmail.de>
Date: Wed, 25 Jun 2025 14:05:09 +0200
Subject: [PATCH] fix: identify correct times in anomaly detection

---
 .../employees-logged-in.detector.ts           | 38 +++++++++++++++----
 1 file changed, 31 insertions(+), 7 deletions(-)

diff --git a/service/data-hub/data-connector/src/modules/feat-anomalies/anomaly-detectors/employees-logged-in.detector.ts b/service/data-hub/data-connector/src/modules/feat-anomalies/anomaly-detectors/employees-logged-in.detector.ts
index add8df3..b14f8b5 100644
--- a/service/data-hub/data-connector/src/modules/feat-anomalies/anomaly-detectors/employees-logged-in.detector.ts
+++ b/service/data-hub/data-connector/src/modules/feat-anomalies/anomaly-detectors/employees-logged-in.detector.ts
@@ -2,13 +2,17 @@ import { Logger } from '@nestjs/common';
 import { Anomaly, Employee, Prisma, Tour } from '@prisma/client';
 import {
   Interval,
+  addMilliseconds,
   addMinutes,
   format,
+  getHours,
+  getMinutes,
   isBefore,
   isWithinInterval,
   set,
+  subMilliseconds,
 } from 'date-fns';
-import { fromZonedTime, toZonedTime } from 'date-fns-tz';
+import { getTimezoneOffset, toZonedTime } from 'date-fns-tz';
 
 import { AnomalyTypes } from 'src/modules/feat-business-objects/entities/anomaly/anomaly-types.enum';
 import { AnomalyDetector } from './anomaly-detector.class';
@@ -100,7 +104,10 @@ export class EmployeesLoggedInDetector extends AnomalyDetector {
             },
             {
               description: `Zeitpunkt der Tour Anfahrt: ${format(
-                toZonedTime(startOfTour, 'Europe/Berlin'),
+                addMilliseconds(
+                  startOfTour,
+                  getTimezoneOffset('Europe/Berlin', startOfTour),
+                ),
                 'HH:mm',
               )}`,
             },
@@ -108,14 +115,17 @@ export class EmployeesLoggedInDetector extends AnomalyDetector {
               ? [
                   {
                     description: `Registrierte Anwesenheit: ${format(
-                      toZonedTime(attendanceInterval.start, 'Europe/Berlin'),
+                      addMilliseconds(
+                        attendanceInterval.start,
+                        getTimezoneOffset('Europe/Berlin', startOfTour),
+                      ),
                       'HH:mm',
                     )}${
                       attendanceInterval.end
                         ? ` - ${format(
-                            toZonedTime(
+                            addMilliseconds(
                               attendanceInterval.end,
-                              'Europe/Berlin',
+                              getTimezoneOffset('Europe/Berlin', startOfTour),
                             ),
                             'HH:mm',
                           )}`
@@ -326,8 +336,22 @@ export class EmployeesLoggedInDetector extends AnomalyDetector {
 
   private getStartOfTour(startDate: Date, startBegin: string) {
     if (!startBegin) return null;
-    const zonedTime = toZonedTime(startDate, 'Europe/Berlin');
+
     const [hours, minutes] = startBegin.split(':').map((v) => +v);
-    return fromZonedTime(set(zonedTime, { hours, minutes }), 'Europe/Berlin');
+    const tempDate = subMilliseconds(
+      set(startDate, { hours, minutes }),
+      getTimezoneOffset('Europe/Berlin', startDate),
+    );
+    const hourValue = getHours(tempDate);
+    const minuteValue = getMinutes(tempDate);
+    const modifiedTime = set(startDate, {
+      hours: hourValue,
+      minutes: minuteValue,
+    });
+
+    // this.logger.debug(
+    //   `getStartOfTour(${startDate.toISOString()}, ${startBegin}): ${modifiedTime.toISOString()}`,
+    // );
+    return modifiedTime;
   }
 }