using System;

using System.Collections.Generic;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        Dictionary<String, String> input = new Dictionary<String, String>();

        input.Add("awm_onholddate", "/Date(1718417337000)/");

        Dictionary<String, String> output = new Dictionary<String, String>();

        foreach(KeyValuePair<string, string> kvp in input)

        {

            String k = kvp.Key;

            String v = kvp.Value;

            DateTimeOffset d = DateTimeOffset.FromUnixTimeMilliseconds(Int64.Parse(new Regex(@"/Date\((\d+)\)/").Match(v).Groups[1].Value));

            output.Add(k + "1", d.ToString("M/dd/yyyy h:mm:ss tt"));

            output.Add(k + "2", d.ToString("yyyy-MM-ddTHH:mm:ss"));

            output.Add(k + "3", d.ToString("yyyy-MM-ddTHH:mm:ss"));

            output.Add(k + "4", d.ToString("M/dd/yyyy h:mm:ss tt"));

​

        }

        foreach(KeyValuePair<string, string> kvp in output)

        {

            Console.WriteLine(kvp.Key + " " + kvp.Value);

        }

    }

}