sqlbulkcopy - When converting string to DateTime

I am using this code to insert a csv file to my database:

    private void InsertDataIntoSQLServerUsingSQLBulkCopy(DataTable csvFileData)
    {
        using (SqlConnection dbConnection = new SqlConnection(ConnectionString))
        {
            dbConnection.Open();
            using (SqlBulkCopy s = new SqlBulkCopy(dbConnection))
            {
                s.DestinationTableName = "tablename";
                foreach (var column in csvFileData.Columns)
                    s.ColumnMappings.Add(column.ToString(), column.ToString());
                s.WriteToServer(csvFileData);
            }
        }
    }


    private static DataTable GetDataTabletFromCSVFile(string csv_file_path)
    {
        DataTable csvData = new DataTable();
        try
        {
            using (TextFieldParser csvReader = new TextFieldParser(csv_file_path))
            {
                csvReader.SetDelimiters(new string[] { "," });
                csvReader.HasFieldsEnclosedInQuotes = true;
                string[] colFields = csvReader.ReadFields();
                foreach (string column in colFields)
                {
                    DataColumn datecolumn = new DataColumn(column);
                    datecolumn.AllowDBNull = true;
                    csvData.Columns.Add(datecolumn);

                }
                while (!csvReader.EndOfData)
                {
                    string[] fieldData = csvReader.ReadFields();

                    for (int i = 0; i < fieldData.Length; i++)
                    {
                        if (fieldData[i] == "")
                        {
                            fieldData[i] = null;
                        }
                    }
                    csvData.Rows.Add(fieldData);
                }
            }
        }

My database has temporary data in it. To test this code I copied fields with headers from SQL server and pasted it into an excel file. I then saved the excel file to csv and ran the code. It adds the data from the csv to the database perfectly!

I then tried running a csv file with similar values to my original csv file and its giving me a 'String to DateTime' Exception. So I know something is up with the Dates and I know that the excel columns are in value of 'Date'.

Im really scratching my head with this one. Any good way to parse columns with dates?