using System;

public class Program

{

    public static void Main()

    {

        // ultimate goal is to get time of day

        // var totalSeconds = DateTime.UtcNow.TimeOfDay;

        // remove the hour

        // totalSeconds = totalSeconds.Subtract(TimeSpan.FromHours(dt.Hours)).TotalSeconds;

        // and run the below if test

        // a,b,c,d are hardcoded values to substract based on the if and else if's

        var a = TimeSpan.FromMinutes(16).TotalSeconds;

        var b = TimeSpan.FromMinutes(31).TotalSeconds;

        var c = TimeSpan.FromMinutes(46).TotalSeconds;

        var d = TimeSpan.FromMinutes(61).TotalSeconds;

        // total seconds is meant for testing the ifs

        var totalSeconds = TimeSpan.FromSeconds(133).TotalSeconds;

        var total = TimeSpan.FromMinutes((25-16)*15);

        Console.WriteLine("Total without changes {0}", total);

        double seconds = 0;

        if (totalSeconds >= 2460) // if minute is equal or above 46 or below 1 minute

        {

            var res = d - totalSeconds;

            seconds = total.TotalSeconds-res;

        }

        else if (totalSeconds >= 2100) // if minute is equal or above 31 and below 46

        {

            var res = c - totalSeconds;

            seconds = total.TotalSeconds-res;

        }

        else if (totalSeconds >= 960) // if minute is equal or above 16 and below 31

        {

            var res = b - totalSeconds;

            seconds = total.TotalSeconds-res;

        }

        else if (totalSeconds >= 60) // if minute is equal or above 1 and below 16

        {

            var res = a - totalSeconds;

            seconds = total.TotalSeconds+res;

        }

        else // if minute is below 1

        {

            seconds = total.TotalSeconds- totalSeconds;

        }

        Console.WriteLine(TimeSpan.FromSeconds(seconds));

    }

}