Replaced UtcNow with fixed datetime

Tests/Serialization/ComplexObject/Model.cs

@@ -366,8 +366,16 @@ public class Payment : IRecord
         if (Method != other.Method) return false;
         if (Amount != other.Amount) return false;
         if (Reference != other.Reference) return false;
-        //if (Timestamp != other.Timestamp) return false;
-        //if (TimestampAsLong != other.TimestampAsLong) return false;
+
+        if (Timestamp == DateTime.MinValue || other.Timestamp == DateTime.MinValue)
+        {
+            if (TimestampAsLong != other.TimestampAsLong)
+                return false;
+        }
+        else
+            if (!ModelRunner.DatesEqual(Timestamp, other.Timestamp))
+                return false;
+
         if (Fee != other.Fee) return false;
         //if (CurrencyOverride != other.CurrencyOverride) return false;
 
@@ -475,6 +483,7 @@ public class DocumentHeader : IRecord
     [FlatBufferItem(8), Ignore, IgnoreMember]
     public Variant[] MetaValues { get; set; }
 
+
     public override bool Equals(object? obj)
     {
         var other = obj as DocumentHeader;
@@ -485,8 +494,10 @@ public class DocumentHeader : IRecord
         if (Version != other.Version) return false;
         //if (CreatedAtAsLong != other.CreatedAtAsLong) return false;
         //if (UpdatedAtAsLong != other.UpdatedAtAsLong) return false;
-        if (CreatedAt != other.CreatedAt) return false;
-        if (UpdatedAt != other.UpdatedAt) return false;
+        if (!ModelRunner.DatesEqual(CreatedAt, other.CreatedAt))
+            return false;
+        if (UpdatedAt != other.UpdatedAt)
+            return false;
 
         if (Currency != other.Currency) return false;
         if (Notes != other.Notes) return false;

Tests/Serialization/ComplexObject/ModelGenerator.cs

@@ -32,7 +32,7 @@ public static class ModelGenerator
         var seller = MakeParty(rng, opt.IncludeV2Fields, isSeller: true, opt.IncludeUnicode);
         var buyer = MakeParty(rng, opt.IncludeV2Fields, isSeller: false, opt.IncludeUnicode);
 
-        var createdAt = DateTime.UtcNow.AddMinutes(-rng.Next(0, 60 * 24));
+        var createdAt = ModelRunner.FixedDateTime.AddMinutes(-rng.Next(0, 60 * 24));
         var doc = new BusinessDocument
         {
             Header = new DocumentHeader
@@ -101,7 +101,7 @@ public static class ModelGenerator
         var rng = new Random(seed);
         var v2 = DeepClone(v1);
 
-        v2.Header.UpdatedAt = DateTime.UtcNow;
+        v2.Header.UpdatedAt = ModelRunner.FixedDateTime;
         var toChange = Math.Max(1, (int)Math.Round(v2.Items.Length * changeRatio));
 
         // change random lines
@@ -112,7 +112,7 @@ public static class ModelGenerator
             li.Qty = RoundQty(li.Qty + (double)(rng.NextDouble() * 2.0 - 1.0)); // ±1
             li.UnitPrice = RoundMoney(li.UnitPrice * (double)(0.95 + rng.NextDouble() * 0.1)); // ±5%
             if (li.Ext == null) li.Ext = new Dictionary<string, Variant>();
-            li.Ext["lastEdit"] = VDate(DateTime.UtcNow);
+            li.Ext["lastEdit"] = VDate(ModelRunner.FixedDateTime);
             li.ExtKeys = li.Ext.Keys.ToArray();
             li.ExtValues = li.Ext.Values.ToArray();
         }
@@ -226,7 +226,7 @@ public static class ModelGenerator
             Method = (PaymentMethod)rng.Next(0, 5),
             Amount = RoundMoney(amount),
             Reference = "REF-" + rng.Next(100_000, 999_999),
-            Timestamp = DateTime.UtcNow.AddMinutes(-rng.Next(0, 60 * 24)),
+            Timestamp = ModelRunner.FixedDateTime.AddMinutes(-rng.Next(0, 60 * 24)),
             Fee = includeV2 && rng.Next(0, 2) == 0 ? RoundMoney((double)rng.NextDouble() * 2.0) : null,
             //CurrencyOverride = includeV2 && rng.Next(0, 2) == 0 ? Currency.IQD : Currency.USD
         };

Tests/Serialization/ComplexObject/ModelRunner.cs

@@ -304,6 +304,14 @@ public sealed class ModelRunner
     private static volatile byte[]? _sinkBytes;
     private static volatile BusinessDocument? _sinkDoc;
 
+    // DateTime is fixed to guarantee consistent serialization across runs (otherwise, DateTime.UtcNow will vary)
+    public static DateTime FixedDateTime = DateTime.Parse("2026-06-08T13:56:00+03:00");
+    //public static DateTime FixedDateTime = new DateTime(2026, 6, 8, 13, 56, 0, DateTimeKind.);
+
+
+
+
+
     public void Run()
     {
         const int Rounds = 100;
@@ -417,7 +425,7 @@ public sealed class ModelRunner
 
             Console.WriteLine();
 
-            File.AppendAllLines("complex_model_results.csv", st.ToString().Split(Environment.NewLine));
+            File.WriteAllLines($"complex_model_results_{wName.ToLower()}.csv", st.ToString().Split(Environment.NewLine));
         }
     }
 
@@ -490,4 +498,20 @@ public sealed class ModelRunner
 
         return result;
     }
+
+
+    public static bool DatesEqual(DateTime dt1, DateTime dt2)
+    {
+        // Quick fix to handle DateTimeKind differences (local vs UTC) in roundtrip equality checks
+        if (dt1 == dt2)
+            return true;
+        if (dt1.ToUniversalTime() == dt2.ToUniversalTime())
+            return true;
+        if (dt1.ToUniversalTime() == dt2)
+            return true;
+        if (dt2.ToUniversalTime() == dt1)
+            return true;
+
+        return false;
+    }
 }