using System;

using System.Collections.Generic;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        var time = "2019-09-18T03:46:42+09:00";

        var datetime = GetTxnDateTime(time);

        Console.WriteLine(datetime["date"]);

        Console.WriteLine(datetime["time"]);

        var datetime2 = GetTxnDateTime2(time);

        Console.WriteLine(datetime2["date"]);

        Console.WriteLine(datetime2["time"]);

    }

    private static Dictionary<string, string> GetTxnDateTime(string txnDateTime)

    {

        var dateTime = new Dictionary<string, string>();

        var pattern = "yyyy-MM-ddTHH:mm:sszzz";

​

        if (DateTime.TryParseExact(txnDateTime, pattern, null, DateTimeStyles.None, out DateTime tranDate))

        {

            dateTime.Add("date", tranDate.ToString("yyyyMMdd"));

            dateTime.Add("time", tranDate.ToString("HHmmss"));

        }

        else

        {

            dateTime.Add("date", "");

            dateTime.Add("time", "");

        }

        return dateTime;

    }

​

    private static Dictionary<string, string> GetTxnDateTime2(string txnDateTime)

    {

        var dateTime = new Dictionary<string, string>();

        var pattern = "yyyy-MM-ddTHH:mm:sszzz";

​

        if (DateTimeOffset.TryParseExact(txnDateTime, pattern, null, DateTimeStyles.None, out DateTimeOffset tranDate))

        {

            dateTime.Add("date", tranDate.ToString("yyyyMMdd"));

            dateTime.Add("time", tranDate.ToString("HHmmss"));

        }

        else

        {

            dateTime.Add("date", "");

            dateTime.Add("time", "");

        }

        return dateTime;

    }

}