csv helper is writing 1 to 12 datetime in different format and 13 to 24 in different datetime format using version 4.0.30319

[Prashantpaliwal911]

var textwriter = new StreamWriter(memoryStream);
{
    using (var csv = new CsvWriter(textwriter))
    {
        csv.Configuration.Delimiter = CsvColumnsDelimiter.ToString();
       
        foreach (DataColumn column in dataTable.Columns)
        {
            csv.WriteField(column.ColumnName);
        }
        csv.NextRecord();

        foreach (DataRow row in dataTable.Rows)
        {
            for (var i = 0; i < dataTable.Columns.Count; i++)
            {
                var dataType = dataTable.Columns[i].DataType;
                string cellValue;

                if (row[i] == null || row[i] == DBNull.Value)
                {
                    cellValue = string.Empty;
                    csv.WriteField(cellValue);
                    continue;
                }

                switch (Type.GetTypeCode(dataType))
                {
                    case TypeCode.DateTime:
                        cellValue = ((DateTime)row[i]).ToString("dd-MMM-yyyy HH:m:s tt", Thread.CurrentThread.CurrentCulture);
                        break;
                    //Decimal cell values are modified depends on the current culture.
                    case TypeCode.Decimal:
                        cellValue = decimal.TryParse(row[i].ToString().Trim(), out var decResult)
                            ? decResult.ToString("N10", Thread.CurrentThread.CurrentCulture).TrimEnd('0').TrimEnd(',').TrimEnd('.')
                            : string.Empty;
                        break;
                    default:
                        cellValue = Convert.ToString(row[i], Thread.CurrentThread.CurrentCulture);
                        break;
                }

                csv.WriteField(cellValue);
            }
            csv.NextRecord();
        }
    }
}

[JoshClose]

Can you write a full example that shows the problem? Meaning, it contains the input data. Also, we need to see the output in CSV text format, not Excel.