using System;

​

​

public class Program

{

    public static void Main()

    {

        var date = "August 19, 1975 23:15:30 GMT+07:00";

        var format = "MMMM dd, yyyy HH:mm:ss \\G\\M\\TK";

        var d = DateTime.ParseExact(date, format, System.Globalization.CultureInfo.CurrentCulture, System.Globalization.DateTimeStyles.AssumeLocal);

        Console.WriteLine(d);

    }

}