add shel

src/HSchool.Simulation/SimulationOptions.cs

@@ -5,7 +5,7 @@ public sealed class SimulationOptions
 {
     public const string SectionName = "Simulation";
 
-    private DateTime _defaultStartDate = new(2012, 4, 3, 6, 0, 0, DateTimeKind.Utc);
+    private DateTime _defaultStartDate = new(2012, 3, 31, 6, 0, 0, DateTimeKind.Utc);
 
     /// <summary>Fixed simulation steps per second.</summary>
     public int TickRate { get; set; } = 20;