Fix Datetime localization issue when handling serverdate in PostgreSQL (#1158)

* Added utility method NormalizeDbmsDateTime to normalize DateTime objects in postgresql by setting their Kind to Unspecified for consistent handling of time values

* Add method ResetTimeAndKind to reset the Kind property of DateTime when it is Local. This handles cases like Npgsql, which returns DateTime values with Kind=Local, causing comparisons with Kind=Unspecified to fail.

ServerNow always returns the DateTime in the local timezone of the DBMS.

Author: claudiamurialdo

dotnet/src/dotnetframework/GxClasses/Core/GXUtilsCommon.cs

@@ -3277,7 +3277,16 @@ public static DateTime ServerDate(IGxContext context, IDataStoreProvider dataSto
 		{
 			if (dataStore == null)
 				return ServerDate(context, new DataStoreHelperBase().getDataStoreName());
-			return ResetTime(dataStore.serverNow());
+			return ResetTimeAndKind(dataStore.serverNow());
+		}
+
+		private static DateTime ResetTimeAndKind(DateTime dateTime)
+		{
+			if (dateTime.Kind != DateTimeKind.Unspecified)
+			{
+				return new DateTime(dateTime.Year, dateTime.Month, dateTime.Day, 0, 0, 0, 0);
+			}
+			else return ResetTime(dateTime);
 		}
 #if !NETCORE
 		[Obsolete("ServerTime with string dataSource is deprecated, use ServerTime(IGxContext context, Data.NTier.IDataStoreProvider dataStore) instead", false)]

dotnet/src/dotnetframework/GxClasses/Data/GXDataCommon.cs

@@ -1169,6 +1169,11 @@ public virtual string AfterCreateCommand(string stmt, GxParameterCollection parm
 		{
 			return stmt;
 		}
+
+		internal virtual DateTime NormalizeDbmsDateTime(DateTime d)
+		{
+			return d;
+		}
 	}
 
 	public class DbDataAdapterElem

dotnet/src/dotnetframework/GxClasses/Data/GXDataNTier.cs

@@ -752,10 +752,11 @@ public DateTime serverNow()
 		public DateTime serverNowIn(bool hasMilliseconds )
         {
 			string stmt = "";
+			GxDataRecord gxDataRecord = (GxDataRecord)_ds.Db;
 			if (hasMilliseconds)
-				stmt = ((GxDataRecord)_ds.Db).GetServerDateTimeStmtMs(_ds.Connection); 
+				stmt = gxDataRecord.GetServerDateTimeStmtMs(_ds.Connection); 
 			else
-				stmt = ((GxDataRecord)_ds.Db).GetServerDateTimeStmt(_ds.Connection);
+				stmt = gxDataRecord.GetServerDateTimeStmt(_ds.Connection);
 
             if (string.IsNullOrEmpty(stmt))
             {

dotnet/src/dotnetframework/GxClasses/Data/GXDataPostgreSQL.cs

@@ -630,6 +630,14 @@ public override string ConcatOp(int pos)
 		{
 			return ConcatOpValues[pos];
 		}
+		internal override DateTime NormalizeDbmsDateTime(DateTime d)
+		{
+			if (d.Kind != DateTimeKind.Unspecified)
+			{
+				d = new DateTime(d.Year, d.Month, d.Day, d.Hour, d.Minute, d.Second, d.Millisecond);
+			}
+			return d;
+		}
 	}
 	sealed internal class PostgresqlConnectionWrapper : GxAbstractConnectionWrapper
 	{