nhibernateGH-3530: Firebird incorrectly uses the current culture to c…

…onvert dates stores as strings. Address this issue by adding a FirebirdDbDataReader.

src/NHibernate/AdoNet/FirebirdDbDataReader.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Data.Common;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using NHibernate.Id.Insert;
+
+namespace NHibernate.AdoNet
+{
+	public class FirebirdDbDataReader : DbDataReaderWrapper
+	{
+		public FirebirdDbDataReader(DbDataReader reader) : base(reader) { }
+
+		public override DateTime GetDateTime(int ordinal)
+		{
+			var value = DataReader[ordinal];
+
+			return value switch
+			{
+				string s => DateTime.Parse(s, CultureInfo.InvariantCulture),
+				_ => (DateTime) value
+			};
+		}
+	}
+}

src/NHibernate/Async/Driver/FirebirdClientDriver.cs

@@ -0,0 +1,40 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by AsyncGenerator.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Data.Common;
+using System.Linq;
+using System.Reflection;
+using System.Text.RegularExpressions;
+using NHibernate.AdoNet;
+using NHibernate.Dialect;
+using NHibernate.SqlCommand;
+using NHibernate.SqlTypes;
+using NHibernate.Util;
+using Environment = NHibernate.Cfg.Environment;
+
+namespace NHibernate.Driver
+{
+	using System.Threading.Tasks;
+	using System.Threading;
+	public partial class FirebirdClientDriver : ReflectionBasedDriver
+	{
+
+		public override async Task<DbDataReader> ExecuteReaderAsync(DbCommand command, CancellationToken cancellationToken)
+		{
+			cancellationToken.ThrowIfCancellationRequested();
+			var reader = await (command.ExecuteReaderAsync(cancellationToken)).ConfigureAwait(false);
+
+			return new FirebirdDbDataReader(reader);
+		}
+	}
+}

src/NHibernate/Driver/FirebirdClientDriver.cs

@@ -5,6 +5,7 @@
 using System.Linq;
 using System.Reflection;
 using System.Text.RegularExpressions;
+using NHibernate.AdoNet;
 using NHibernate.Dialect;
 using NHibernate.SqlCommand;
 using NHibernate.SqlTypes;
@@ -17,7 +18,7 @@ namespace NHibernate.Driver
 	/// A NHibernate Driver for using the Firebird data provider located in
 	/// <c>FirebirdSql.Data.FirebirdClient</c> assembly.
 	/// </summary>
-	public class FirebirdClientDriver : ReflectionBasedDriver
+	public partial class FirebirdClientDriver : ReflectionBasedDriver
 	{
 		private const string SELECT_CLAUSE_EXP = @"(?<=\bselect\b|\bwhere\b).*";
 		private const string CAST_PARAMS_EXP =
@@ -212,5 +213,12 @@ public void ClearPool(string connectionString)
 		/// See http://tracker.firebirdsql.org/browse/DNET-766.
 		/// </summary>
 		public override bool SupportsEnlistmentWhenAutoEnlistmentIsDisabled => false;
+
+		public override DbDataReader ExecuteReader(DbCommand command)
+		{
+			var reader = command.ExecuteReader();
+
+			return new FirebirdDbDataReader(reader);
+		}
 	}
 }