using System;

​

public class Program

{

    public static void Main()

    {   

        DateTime startDate = new DateTime(2021,01,01,0,0,0);

        DateTime endDate = new DateTime(2021,01,05,23,59,59);

​

        DateTime randomDate = GetRandomDate(startDate, endDate);

        Console.WriteLine(randomDate.ToString("yyy-MM-dd HH:mm:ss"));

        Console.WriteLine();

        //the call inside the For Loop:

        var cliPrefix = "0123456";

        var cliNumber = 10;

        for (int i = 0; i < cliNumber; i++)

        {

            //Append CLI0 to the end of the CLI prefix that has been created

            var CLI = cliPrefix + "CLI" + i.ToString();                        

            DateTime callDate = GetRandomDateJames(startDate, endDate);

​

​

            Console.WriteLine(callDate.ToString("yyy-MM-dd HH:mm:ss"));

        }

    }

​

    private static DateTime GetRandomDate(DateTime startDate, DateTime endDate)

    {       

        var rnd = new Random();

        TimeSpan timeSpan = endDate - startDate;

        TimeSpan newSpan = new TimeSpan(0, rnd.Next(0, (int)timeSpan.TotalMinutes), 0);

        DateTime newDate = startDate + newSpan;

        return newDate;

    }

    private static DateTime GetRandomDateJames(DateTime startDate, DateTime endDate)

        {

            var rnd = new Random();

            TimeSpan timeSpan = endDate - startDate;

            TimeSpan newSpan = new TimeSpan(0, rnd.Next(0, (int)timeSpan.TotalMinutes), 0);

            DateTime newDate = startDate + newSpan;

            return newDate;

        }

​

}