using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        System.Globalization.CultureInfo provider = System.Globalization.CultureInfo.InvariantCulture;

        //var c = CultureInfo.CreateSpecificCulture("pt-BR");

        // Defining Format and Testing it via "DateTime.ToString(format)"

        string format = "MM/dd/yyyy HH:mm:ss tt"; 

        string dtNow  = DateTime.Now.ToString (format);

        Console.WriteLine ("Date Time Now : " + dtNow);

        // Trying to Parse DateTime on the same Format defined Above

        DateTime time;

        if (DateTime.TryParseExact (dtNow, format, provider, System.Globalization.DateTimeStyles.None, out time))

        {

            // If TryParseExact Worked

            Console.WriteLine ("Result: " + time.ToString ());  

        }

        else

        {

            // If TryParseExact Failed

            Console.WriteLine ("Failed to Parse Date");

        }

        // Trying to use method with higher tolerance

        ParseDate ("5/4/2015 2:00:09 PM", new String[] {format}, out time);

        Console.WriteLine (time);

    }

    public static void ParseDate (string value, string[] masks, out DateTime result)

    {   

        DateTime.TryParseExact(value, masks,

            System.Globalization.CultureInfo.InvariantCulture,

            System.Globalization.DateTimeStyles.AssumeUniversal

            | System.Globalization.DateTimeStyles.AdjustToUniversal

            | System.Globalization.DateTimeStyles.AllowInnerWhite

            | System.Globalization.DateTimeStyles.AllowLeadingWhite

            | System.Globalization.DateTimeStyles.AllowTrailingWhite,

                out result);

    }

}