MH: FizHof Feiertage

ReportImp/FizHof/Service/CustomVacationService.cs

@@ -38,7 +38,31 @@ namespace FizHof.Service
                 list.Add(new FeiertagDC { Datum = new DateTime(year, 12, 31), Name = "Silvester" });
             }
 
+            if (year >= 2023)
+            {
+                list.Add(new FeiertagDC { Datum = CalculateBussUndBettag(year), Name = "Buß- und Bettag" });
+                list.Add(new FeiertagDC { Datum = new DateTime(year, 12, 24), Name = "Heiligabend" });
+                list.Add(new FeiertagDC { Datum = new DateTime(year, 12, 31), Name = "Silvester" });
+            }
+
             return list;
         }
+
+        private static DateTime CalculateBussUndBettag(int year)
+        {
+            DateTime firstAdventSunday = CalculateFirstAdventSunday(year);
+            DateTime bußUndBettag = firstAdventSunday.AddDays(-11); // Mittwoch vor dem 23. November
+
+            return bußUndBettag;
+        }
+
+        private static DateTime CalculateFirstAdventSunday(int year)
+        {
+            DateTime christmas = new DateTime(year, 12, 25);
+            int daysUntilSunday = ((int)christmas.DayOfWeek + 7 - (int)DayOfWeek.Sunday) % 7;
+            DateTime firstAdventSunday = christmas.AddDays(-daysUntilSunday - 21); // 4 Wochen vor dem 1. Advent
+
+            return firstAdventSunday;
+        }
     }
 }