C# Example of DateTime.ParseExact

using System;
using System.Globalization;

public class Example
{
    public static void Main()
    {
        string dateString, format;
        DateTime result;
        CultureInfo provider = CultureInfo.InvariantCulture;

        // Parse date-only value with invariant culture.
        dateString = "06/15/2008";
        format = "d";
        try
        {
            result = DateTime.ParseExact(dateString, format, provider);
            Console.WriteLine("{0} converts to {1}.", dateString, result.ToString());
        }
        catch (FormatException)
        {
            Console.WriteLine("{0} is not in the correct format.", dateString);
        }

        // Parse date-only value without leading zero in month using "d" format.
        // Should throw a FormatException because standard short date pattern of
        // invariant culture requires two-digit month.
        dateString = "6/15/2008";
        try
        {
            result = DateTime.ParseExact(dateString, format, provider);
            Console.WriteLine("{0} converts to {1}.", dateString, result.ToString());
        }
        catch (FormatException)
        {
            Console.WriteLine("{0} is not in the correct format.", dateString);
        }

        // Parse date and time with custom specifier.
        dateString = "Sun 15 Jun 2008 8:30 AM -06:00";
        format = "ddd dd MMM yyyy h:mm tt zzz";
        try
        {
            result = DateTime.ParseExact(dateString, format, provider);
            Console.WriteLine("{0} converts to {1}.", dateString, result.ToString());
        }
        catch (FormatException)
        {
            Console.WriteLine("{0} is not in the correct format.", dateString);
        }

        // Parse date and time with offset but without offset's minutes.
        // Should throw a FormatException because "zzz" specifier requires leading
        // zero in hours.
        dateString = "Sun 15 Jun 2008 8:30 AM -06";
        try
        {
            result = DateTime.ParseExact(dateString, format, provider);
            Console.WriteLine("{0} converts to {1}.", dateString, result.ToString());
        }
        catch (FormatException)
        {
            Console.WriteLine("{0} is not in the correct format.", dateString);
        }

        dateString = "15/06/2008 08:30";
        format = "g";
        provider = new CultureInfo("fr-FR");
        try
        {
            result = DateTime.ParseExact(dateString, format, provider);
            Console.WriteLine("{0} converts to {1}.", dateString, result.ToString());
        }
        catch (FormatException)
        {
            Console.WriteLine("{0} is not in the correct format.", dateString);
        }

        // Parse a date that includes seconds and milliseconds
        // by using the French (France) and invariant cultures.
        dateString = "18/08/2015 06:30:15.006542";
        format = "dd/MM/yyyy HH:mm:ss.ffffff";
        try
        {
            result = DateTime.ParseExact(dateString, format, provider);
            Console.WriteLine("{0} converts to {1}.", dateString, result.ToString());
        }
        catch (FormatException)
        {
            Console.WriteLine("{0} is not in the correct format.", dateString);
        }
    }
}

Output:

• 06/15/2008 converts to 6/15/2008 12:00:00 AM.
• 6/15/2008 is not in the correct format.
• Sun 15 Jun 2008 8:30 AM -06:00 converts to 6/15/2008 7:30:00 AM.
• Sun 15 Jun 2008 8:30 AM -06 is not in the correct format.
• 15/06/2008 08:30 converts to 6/15/2008 8:30:00 AM.
• 18/08/2015 06:30:15.006542 converts to 8/18/2015 6:30:15 AM.

Source of the code from Microsoft Link