using System;

public class Program

{

    public static void Main()

    {

        // note hh is not that useful, but HH is.

        var dt = DateTime.ParseExact("10/23/2016 04:50:57 PM", "MM/dd/yyyy h:mm:ss tt", System.Globalization.CultureInfo.CurrentCulture);

        dt = DateTime.ParseExact("10/23/2016 12:50:57 PM", "MM/dd/yyyy h:mm:ss tt", System.Globalization.CultureInfo.CurrentCulture);

        Console.WriteLine(dt.Hour);

    }

}