ClientContext -Getting Date from List and Passing the Caml Query

static string startDateFx = Convert.ToDateTime("05/01/2019").ToString("yyyy-MM-ddTHH:mm:ssZ");  //DateTime.Now.AddDays(-20).ToString("yyyy-MM-ddTHH:mm:ssZ");

        static string endDatFx = Convert.ToDateTime("05/09/2019").ToString("yyyy-MM-ddTHH:mm:ssZ");//DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ssZ");

  using (SP.ClientContext clientContext = new SP.ClientContext(siteUrl))

            {

                try

                {

                    SP.List configList = clientContext.Web.Lists.GetByTitle(configListName);

                    SP.View ConfiglistView = configList.Views.GetByTitle("All Items");

                    ConfiglistView.RowLimit = 2147483647;

                    clientContext.Load(ConfiglistView);

                    clientContext.ExecuteQuery();

                    SP.CamlQuery query = new SP.CamlQuery();

                    SP.ListItemCollection configItems = configList.GetItems(query);

                    clientContext.Load(ConfiglistView);

                    clientContext.Load(configItems);

                    clientContext.ExecuteQuery();

                    if (configItems != null && configItems.Count > 0)

                    {                      

                        foreach (SP.ListItem item in configItems)

                        {

                            startDateFx = (DateTime.SpecifyKind(DateTime.Parse(item["StartDate"].ToString()), DateTimeKind.Utc)).ToLocalTime().ToString("yyyy-MM-ddTHH:mm:ssZ");

                            endDatFx = (DateTime.SpecifyKind(DateTime.Parse(item["EndDate"].ToString()), DateTimeKind.Utc)).ToLocalTime().ToString("yyyy-MM-ddTHH:mm:ssZ");                          

                        }

                        GetListReport(clientContext, ListName, xlReportPath, DateTime.Now.ToString("dd MMM yyyy") + fileName, startDateFx, endDatFx);

                    }

                }

                catch (Exception ex)

                {

                    Console.WriteLine();

                    Console.ForegroundColor = ConsoleColor.Red;

                    Console.WriteLine("Authentication failed." + ex.Message);

                    Console.ForegroundColor = ConsoleColor.Gray;

                }

            }

//sample one

  SP.CamlQuery query = new SP.CamlQuery();

            //  query.ViewXml = "<View Scope='RecursiveAll'><Query>" + listView.ListViewXml + "</Query></View>";

            query.ViewXml = @"<View>" +

"<Query>" + "<Where><And>" +

    "<Geq>" +

        "<FieldRef Name='ClosureDate'/>" +

        "<Value Type='DateTime' IncludeTimeValue='FALSE'>" + startDateFx + "</Value>" +

    "</Geq>" +

    "<Leq>" +

        "<FieldRef Name='ClosureDate'/>" +

        "<Value Type='DateTime' IncludeTimeValue='FALSE'>" + endDatFx + "</Value>" +

    "</Leq>" +

    "</And></Where>" +

"</Query>" +

"</View>";