using System;

public class Program

{

    public static void Main()

    {

        ////////////////////////////////////////////////////////////////////////////////////////////////////////////

        // Client app

        ////////////////////////////////////////////////////////////////////////////////////////////////////////////

        var clientTimestamp = DateTimeOffset.Now.DateTime;

        var jsonDateTime = clientTimestamp.ToString("yyyy-MM-ddThh:mm:ss.fffZ");

        // Then, the client app sends data as JSON to the server app...

        ////////////////////////////////////////////////////////////////////////////////////////////////////////////

        // Server app

        ////////////////////////////////////////////////////////////////////////////////////////////////////////////

        // Mimick as if we received a json string with a DateTime in it. Parse that back to a real DateTime object.

        // This is also the value that will be stored in the database

        var serverDateTime = DateTime.Parse(jsonDateTime);

        Console.WriteLine("Ticks serverDateTime:             " + serverDateTime.Ticks.ToString());

        // A minute or so later, a recurring job checks the database for newly added records in the range of: 30 minutes ago till now.

        // Create a new DateTime Now minus 30 minutes... Both Ticks values below are greater than the jsonDateTime ticks?

        // DateTimeOffset:

        // This value is larger, even with the minus -10 minutes?

        var nowDateTimeOffset = DateTimeOffset.Now.AddMinutes(-10).Ticks.ToString();

        Console.WriteLine("Ticks nowDateTime -10 minutes:    " + nowDateTimeOffset);

        // DateTime

        // This value is larger, even with the minus -10 minutes?

        var nowDateTime = DateTimeOffset.Now.AddMinutes(-10).Ticks.ToString();

        Console.WriteLine("Ticks nowDateTime -10 minutes:    " + nowDateTime);

    }

}