DateTime.Parse always throws exception in a specific culture

Question

I have some old log files I have to parse - apparently the date time was saved like: 18/12/2012 11:09:39 p.m. - All my attempts to parse these have failed. I am completely lost on this - Any help or direction would be great!

 CultureInfo cultureInfo = new CultureInfo( "es-MX" , true );
        string date = "18/12/2012 11:09:39 p.m.";

        DateTime dt = new DateTime( 2012 , 12 , 18 , 11 , 9 , 39 ).AddHours( 12 );

        this.richTextBox1.Text += date + Environment.NewLine;
        this.richTextBox1.Text += dt.ToString( cultureInfo ) + Environment.NewLine;
        this.richTextBox1.Text += dt.ToString() + Environment.NewLine;

        foreach ( var item in richTextBox1.Lines )
        {
            try
            {
               DateTime d=  DateTime.Parse( item );
               this.richTextBox1.Text += d.ToString() + Environment.NewLine ;

            }
            catch ( Exception ee)
            {
                this.richTextBox1.Text += ee.Message + Environment.NewLine ;

            }
        }

Answer 1

Some dates are correct in the log file(s) some have the odd formatting that end in p. m. or p.m.. All methods above seem to fail - and yes I tried them all :( This was my hack/fix for the problem:

     CultureInfo cultureInfo = new CultureInfo( "es-MX" , true );
     Date = DateTime.Parse( date.Replace( "p. m." , "PM" ).Replace( "p.m." , "PM" ).Replace( "." , "" ).ToUpper() , cultureInfo );