Revert "Adjust DateTime parameters"

This reverts commit cb2dad6.

Author: hazzik

src/NHibernate.Test/TypesTest/AbstractDateTimeTypeFixture.cs

@@ -548,7 +548,7 @@ protected DateTimeKind GetTypeKind()
 		}
 	}
 
-	public class ClientDriverWithParamsStats : IDriver, IParameterAdjuster
+	public class ClientDriverWithParamsStats : IDriver
 	{
 		private readonly Dictionary<SqlType, int> _usedSqlTypes = new Dictionary<SqlType, int>();
 		private readonly Dictionary<DbType, int> _usedDbTypes = new Dictionary<DbType, int>();
@@ -679,11 +679,5 @@ void IDriver.AdjustCommand(DbCommand command)
 		DateTime IDriver.MinDate => _driverImplementation.MinDate;
 
 		#endregion
-
-		public void AdjustParameterForValue(DbParameter parameter, SqlType sqlType, object value)
-		{
-			var adjustingDriver = _driverImplementation as IParameterAdjuster;
-			adjustingDriver?.AdjustParameterForValue(parameter, sqlType, value);
-		}
 	}
 }

src/NHibernate/Driver/NpgsqlDriver.cs

@@ -1,8 +1,6 @@
-using System;
 using System.Data;
 using System.Data.Common;
 using NHibernate.AdoNet;
-using NHibernate.SqlTypes;
 
 namespace NHibernate.Driver
 {
@@ -27,7 +25,7 @@ namespace NHibernate.Driver
 	/// <a href="http://pgfoundry.org/projects/npgsql">http://pgfoundry.org/projects/npgsql</a>. 
 	/// </p>
 	/// </remarks>
-	public class NpgsqlDriver : ReflectionBasedDriver, IEmbeddedBatcherFactoryProvider, IParameterAdjuster
+	public class NpgsqlDriver : ReflectionBasedDriver, IEmbeddedBatcherFactoryProvider
 	{
 		/// <summary>
 		/// Initializes a new instance of the <see cref="NpgsqlDriver"/> class.
@@ -84,19 +82,10 @@ protected override void InitializeParameter(DbParameter dbParam, string name, Sq
 
 		// Prior to v3, Npgsql was expecting DateTime for time.
 		// https://github.com/npgsql/npgsql/issues/347
-		public override bool RequiresTimeSpanForTime => DriverVersionMajor >= 3;
-
-		private int DriverVersionMajor => DriverVersion?.Major ?? 3;
+		public override bool RequiresTimeSpanForTime => (DriverVersion?.Major ?? 3) >= 3;
 
 		public override bool HasDelayedDistributedTransactionCompletion => true;
 
 		System.Type IEmbeddedBatcherFactoryProvider.BatcherFactoryClass => typeof(GenericBatchingBatcherFactory);
-		public void AdjustParameterForValue(DbParameter parameter, SqlType sqlType, object value)
-		{
-			if (DriverVersionMajor >= 6 && sqlType.DbType == DbType.DateTime && value is DateTime time && time.Kind != DateTimeKind.Utc)
-			{
-				parameter.DbType = DbType.DateTime2;
-			}
-		}
 	}
 }

src/NHibernate/Type/AbstractDateTimeType.cs

@@ -3,7 +3,6 @@
 using System.Collections.Generic;
 using System.Data.Common;
 using System.Globalization;
-using NHibernate.Driver;
 using NHibernate.Engine;
 using NHibernate.SqlTypes;
 
@@ -91,13 +90,7 @@ public override void Set(DbCommand st, object value, int index, ISessionImplemen
 			// hour with daylight shift to be always wrongly converted. So better just fail.
 			if (Kind != DateTimeKind.Unspecified && dateValue.Kind != Kind)
 				throw new ArgumentException($"{Name} expect date kind {Kind} but it is {dateValue.Kind}", nameof(value));
-
-			var parameter = st.Parameters[index];
-
-			//Allow the driver to adjust the parameter for the value
-			var adjustedValue = AdjustDateTime(dateValue);
-			session.Factory.ConnectionProvider.Driver.AdjustParameterForValue(parameter, SqlType, adjustedValue);
-			parameter.Value = adjustedValue;
+			st.Parameters[index].Value = AdjustDateTime(dateValue);
 		}
 
 		#region IVersionType Members