Enhance TimefixService to correctly handle UTC to local time conversion for date and timestamp values; ensure consistent time representation across the application.

backend/src/services/TimefixService.js

@@ -62,10 +62,21 @@ class TimefixService {
         // Verwende korrigierte Werte aus Timefix
         const tf = timefixForEntry[0];
         
+        // WICHTIG: DB speichert UTC, Frontend erwartet lokale Zeit
         if (typeof tf.fix_date_time === 'string') {
+          // Parse als UTC und konvertiere zu lokaler Zeit
           const [datePart, timePart] = tf.fix_date_time.split(' ');
-          [hours, minutes] = timePart.split(':').map(Number);
+          const [h, m, s] = timePart.split(':').map(Number);
+          
+          // Erstelle UTC-Date aus den Komponenten
+          const [year, month, day] = datePart.split('-').map(Number);
+          const utcDate = new Date(Date.UTC(year, month - 1, day, h, m, s));
+          
+          // Extrahiere lokale Stunden/Minuten
+          hours = utcDate.getHours();
+          minutes = utcDate.getMinutes();
         } else if (tf.fix_date_time instanceof Date) {
+          // Date-Objekt: Verwende lokale Zeit
           hours = tf.fix_date_time.getHours();
           minutes = tf.fix_date_time.getMinutes();
         }
@@ -73,12 +84,23 @@ class TimefixService {
         action = tf.fix_type;
       } else {
         // Keine Korrektur - verwende Original-Werte aus Worklog
+        // WICHTIG: DB speichert UTC, Frontend erwartet lokale Zeit
         if (typeof entry.tstamp === 'string') {
+          // Parse als UTC und konvertiere zu lokaler Zeit
           const [datePart, timePart] = entry.tstamp.split(' ');
-          [hours, minutes] = timePart.split(':').map(Number);
+          const [h, m, s] = timePart.split(':').map(Number);
+          
+          // Erstelle UTC-Date aus den Komponenten
+          const [year, month, day] = datePart.split('-').map(Number);
+          const utcDate = new Date(Date.UTC(year, month - 1, day, h, m, s));
+          
+          // Extrahiere lokale Stunden/Minuten
+          hours = utcDate.getHours();
+          minutes = utcDate.getMinutes();
         } else if (entry.tstamp instanceof Date) {
-          hours = entry.tstamp.getUTCHours();
+          // Date-Objekt: Verwende lokale Zeit
-          minutes = entry.tstamp.getUTCMinutes();
+          hours = entry.tstamp.getHours();
+          minutes = entry.tstamp.getMinutes();
         }
         
         // Parse state