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ErsatzTV.Application/Playouts/Queries/GetPlayoutAlternateSchedulesHandler.cs

@@ -45,8 +45,8 @@ public class GetPlayoutAlternateSchedulesHandler(IDbContextFactory<TvContext> db
                 StartMonth = 1,
                 StartDay = 1,
                 StartYear = null,
-                EndMonth = 1,
-                EndDay = 1,
+                EndMonth = 12,
+                EndDay = 31,
                 EndYear = null
             };
 

ErsatzTV.Core.Tests/Scheduling/AlternateScheduleSelectorTests.cs

@@ -839,5 +839,29 @@ public static class AlternateScheduleSelectorTests
 
             result.IsNone.ShouldBeTrue();
         }
+
+        [Test]
+        public void LimitToDateRange_December_32nd_Should_Not_Crash()
+        {
+            var template = new PlayoutTemplate
+            {
+                DaysOfWeek = AlternateScheduleSelector.AllDaysOfWeek(),
+                DaysOfMonth = AlternateScheduleSelector.AllDaysOfMonth(),
+                MonthsOfYear = AlternateScheduleSelector.AllMonthsOfYear(),
+                LimitToDateRange = true,
+                StartMonth = 12,
+                StartDay = 32,
+                StartYear = 2022,
+                EndMonth = 12,
+                EndDay = 32,
+                EndYear = 2023
+            };
+
+            Option<PlayoutTemplate> result = AlternateScheduleSelector.GetScheduleForDate(
+                new List<PlayoutTemplate> { template },
+                new DateTimeOffset(2023, 3, 1, 0, 0, 0, Offset));
+
+            result.IsNone.ShouldBeFalse();
+        }
     }
 }

ErsatzTV.Core/Scheduling/AlternateScheduleSelector.cs

@@ -50,7 +50,7 @@ public static class AlternateScheduleSelector
                 {
                     // this should only happen with days that are greater than the actual days in the month,
                     // so roll over to the 1st of the next month
-                    start = new DateTime(startYear, item.StartMonth + 1, 1, 0, 0, 0, DateTimeKind.Local);
+                    start = new DateTime(startYear, item.StartMonth, 1, 0, 0, 0, DateTimeKind.Local).AddMonths(1);
                 }
 
                 try