using System;

​

​

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public class Program

{

    public static void Main()

    {

        var start = DateTime.Parse("2022-05-04T14:15:00+00:00").ToUniversalTime();

        // 90 days

        var end90 = DateTime.Parse("2022-08-03T16:59:48+03:00").ToUniversalTime(); 

        // 91 days

        var end91 = DateTime.Parse("2022-08-03T17:44:20+03:00").ToUniversalTime(); 

        var end92 = DateTime.Parse("2022-08-04T11:12:31+03:00").ToUniversalTime(); 

        // this is wrong

        {

            var av90 = end90.Minute + end90.Hour * 100 + (end90 - start).Days * 10000;

            var av91 = end91.Minute + end91.Hour * 100 + (end91 - start).Days * 10000;

            var av92 = end92.Minute + end92.Hour * 100 + (end92 - start).Days * 10000;

            Console.WriteLine("wrong --- av90 " + av90 + " av91 " + av91 + " av92 " + av92);

        }

        // this is ok

        {

            var av90 = end90.Minute + end90.Hour * 100 + (end90.Date - start.Date).Days * 10000;

            var av91 = end91.Minute + end91.Hour * 100 + (end91.Date - start.Date).Days * 10000;

            var av92 = end92.Minute + end92.Hour * 100 + (end92.Date - start.Date).Days * 10000;

            Console.WriteLine("ok    --- av90 " + av90 + " av91 " + av91 + " av92 " + av92);

        }

    }

}