NH-1752 - Adjustments to squash.

Author: fredericDelaporte

src/NHibernate.Test/Async/TypesTest/DateTypeTest.cs

@@ -32,7 +32,7 @@ public Task ReadWriteNormalAsync()
 		{
 			try
 			{
-				var expected = DateTime.Today.Date;
+				var expected = DateTime.Today;
 
 				return ReadWriteAsync(expected);
 			}
@@ -77,6 +77,7 @@ public Task ReadWriteYear750Async()
 
 		private async Task ReadWriteAsync(DateTime expected, CancellationToken cancellationToken = default(CancellationToken))
 		{
+			// Add an hour to check it is correctly ignored once read back from db.
 			var basic = new DateClass { DateValue = expected.AddHours(1) };
 			object savedId;
 			using (var s = OpenSession())

src/NHibernate.Test/TypesTest/DateTypeTest.cs

@@ -54,7 +54,7 @@ public void ShouldBeDateType()
 		[Test]
 		public void ReadWriteNormal()
 		{
-			var expected = DateTime.Today.Date;
+			var expected = DateTime.Today;
 
 			ReadWrite(expected);
 		}
@@ -80,6 +80,7 @@ public void ReadWriteYear750()
 
 		private void ReadWrite(DateTime expected)
 		{
+			// Add an hour to check it is correctly ignored once read back from db.
 			var basic = new DateClass { DateValue = expected.AddHours(1) };
 			object savedId;
 			using (var s = OpenSession())

src/NHibernate/Driver/IDriver.cs

@@ -160,7 +160,7 @@ public interface IDriver
 		bool HasDelayedDistributedTransactionCompletion { get; }
 
 		/// <summary>
-		/// The minimal date supported by this driver.
+		/// The minimal date supplied as a <see cref="DateTime" /> supported by this driver.
 		/// </summary>
 		DateTime MinDate { get; }
 	}

src/NHibernate/Driver/MySqlDataDriver.cs

@@ -90,5 +90,10 @@ public override bool SupportsMultipleQueries
 		}
 
 		public override bool RequiresTimeSpanForTime => true;
+
+		// As of v5.7, lower dates may "work" but without guarantees.
+		// https://dev.mysql.com/doc/refman/5.7/en/datetime.html
+		/// <inheritdoc />
+		public override DateTime MinDate => new DateTime(1000, 1, 1);
 	}
 }