Oracle database returns faulty rows from stored procedure using devart in C#

Question

I have an oracle database with a stored procedure:

PROCEDURE "CalculateChats"
  (
    "In_Conf" IN NUMBER,
    "In_From" IN TIMESTAMP,
    "In_To" IN TIMESTAMP,
    "Out_Cursor" OUT "Cursor"
  ) AS
  BEGIN
  OPEN "Out_Cursor" FOR
  SELECT 
  TO_TIMESTAMP(SUBSTR("Started", 0, 13), 'yyyy-mm-dd hh24:MI' ) as "From", 
  CAST(TO_TIMESTAMP(SUBSTR("Started", 0, 13), 'yyyy-mm-dd hh24:MI') + 1/24 AS TIMESTAMP) as "To", 
  COUNT(*) as "Chats"
  FROM "SomeTableContainingChats" 
  WHERE "Conf" = "In_Conf" 
  AND "Started" >= "In_From"
  AND "Started" <= "In_To" 
  GROUP BY SUBSTR("Started", 0, 13) 
  ORDER BY SUBSTR("Started", 0, 13) ASC;
  END "CalulateChats";

When run, the stored procedure gives me a table [ From | To | NrOfOfferedChats ] The dates are correct compared to the values.

(Example)

[ From                         | To                            | Chats ]
2014-09-15 08:00:00,000000000   2014-09-15 09:00:00,000000000   61
2014-09-15 09:00:00,000000000   2014-09-15 10:00:00,000000000   96
2014-09-15 10:00:00,000000000   2014-09-15 11:00:00,000000000   113
2014-09-15 11:00:00,000000000   2014-09-15 12:00:00,000000000   80

Now i pick it up from the C# code:

 using (var oraclePackage = new OraclePackage())
        {
            oraclePackage.Connection = DbConnection;
            oraclePackage.PackageName = @"CHAOS.""HiddenPackageName""";

            oraclePackage.Parameters.AddWithValue("In_Conf", conf);
            oraclePackage.Parameters.AddWithValue("In_From", from);
            oraclePackage.Parameters.AddWithValue("In_To", to);
            oraclePackage.Parameters.AddWithValue("Out_Cursor", null).Direction = ParameterDirection.Output;
            oraclePackage.Parameters["Out_Cursor"].OracleDbType = OracleDbType.Cursor;

            oraclePackage.ExecuteProcedure(@"""CalculateChats""", oraclePackage.Parameters, true);

            using (OracleDataReader oracleReader = ((OracleCursor)oraclePackage.Parameters["Out_Cursor"].Value).GetDataReader())
            {
                if (oracleReader.HasRows)
                {
                    while (oracleReader.Read())
                    {
                       oracleReader;
                    }
                }
            }
        }

And the data from the oracle is oracleReader = From: 0015-09-14 01:00:00,000000000, To: 0015-09-14 02:00:00,000000000, Chats: 80

Now for the question: What could be a possible cause for the alteration from the database to the C# code, and any suggestion on how to solve it would be apreciated.

Answer 1

After throwing this arround for 2 days i found out

CAST(TO_TIMESTAMP(SUBSTR("Started", 0, 13), 'yyyy-mm-dd hh24:MI') + 1/24 AS TIMESTAMP)

Was converting the timestamp from 2014-09-16 08:00:00 to 16-SEP-14 02:00:00 i'm still not aware why it was converted that way but:

CAST(TO_CHAR("Started", 'YYYY-MM-dd HH24') || ':00:00' AS TIMESTAMP)

Seemed to solve the problem.