using System;

using static System.Console;

using System.Globalization;

public class Program {

    public static void Main(){

        var data = "01/08/2016 9:00 PM";

        DateTime dataOut;

        if (DateTime.TryParseExact(data, "MM/dd/yyyy h:mm tt", CultureInfo.InvariantCulture, DateTimeStyles.None, out dataOut)) {

            WriteLine(dataOut.ToString("MM/dd/yyyy HH:mm"));

        }

        data = "01/08/2016 9:00 AM";

        if (DateTime.TryParseExact(data, "MM/dd/yyyy h:mm tt", CultureInfo.InvariantCulture, DateTimeStyles.None, out dataOut)) {

            WriteLine(dataOut.ToString("MM/dd/yyyy HH:mm"));

        }

    }

}