gistfile1.txt

using System;

public class Program
{
    public static void Main()
    {
        string text = "0|aaaaaa|aaaaaaaaaaa|aaaaaaaaaa|123456|0|0";
        string[] parts = text.Split(new char[] { '|' });
        
        for (int i = 0; i < parts.Length; i++)
        {
            Console.WriteLine($"{i}: {parts[i]}");
        }
        
        if (parts[0].Equals("0"))
        {
            if (parts[6].Equals("0"))
            {
                Console.WriteLine("This is not date");
            }
            else
            {
                Console.WriteLine($"This is date: {parts[6]}");
            }            
        }
    }
}