NH-3919 - Timestamp cleanup of code intended to default null to now but without effect.

Author: fredericDelaporte

src/NHibernate/Type/TimestampType.cs

@@ -1,12 +1,9 @@
 using System;
-using NHibernate.Engine;
 
 namespace NHibernate.Type
 {
 	/// <summary>
-	/// This is almost the exact same type as the <see cref="DateTimeType" /> excepted it can be used
-	/// in the version column, stores it to the accuracy the database supports
-	/// and will default to the value of <see cref="AbstractDateTimeType.Now" /> if the value is not valid.
+	/// This is almost the exact same type as the <see cref="DateTimeType" />.retrieved
 	/// </summary>
 	/// <remarks>
 	/// <para>
@@ -34,10 +31,6 @@ public class TimestampType : AbstractDateTimeType
 		/// <inheritdoc />
 		public override string Name => "Timestamp";
 
-		/// <inheritdoc />
-		protected override DateTime GetDateTimeToSet(object value, ISessionImplementor session) =>
-			(value as DateTime?) ?? Now;
-
 		/// <summary>
 		/// Retrieve the string representation of the timestamp object. This is in the following format:
 		/// <code>

src/NHibernate/Type/TimestampUtcType.cs

@@ -4,9 +4,8 @@
 namespace NHibernate.Type
 {
 	/// <summary>
-	/// This is almost the exact same type as the <see cref="UtcDateTimeType" /> excepted it can be used
-	/// in the version column, stores it to the accuracy the database supports
-	/// and will default to the value of <see cref="AbstractDateTimeType.Now" /> if the value is not a datetime.
+	/// This is almost the exact same type as the <see cref="UtcDateTimeType" /> It is intended
+	/// for use as the version column.
 	/// Moreover, if the value is not an UTC value, it will throw.
 	/// </summary>
 	/// <remarks>
@@ -44,7 +43,7 @@ public class TimestampUtcType : TimestampType
 		/// <inheritdoc />
 		protected override DateTime GetDateTimeToSet(object value, ISessionImplementor session)
 		{
-			var dbValue = base.GetDateTimeToSet(value, session);
+			var dbValue = (DateTime) value;
 			if (dbValue.Kind != DateTimeKind.Utc)
 				throw new ArgumentException("Kind is NOT Utc", nameof(value));
 			return dbValue;