/// <summary>
 /// create an appointment
 /// </summary>
 /// <param name="type">the appointment type</param>
 /// <param name="startTime">the start time</param>
 /// <param name="availableTime">the time span in x * 45min</param>
 /// <param name="instructor">the user to bind the appointment too</param>
 /// <param name="appointmentTable">Optional* the table to execute on</param>
 /// <returns>bool</returns>
 public static bool AddAppointment(string type, DateTime startTime, int availableTime, string instructor, string appointmentTable = AppointmentTable)
 {
     return(MySql.AddAppointment(instructor, startTime.ToString("G",
                                                                CultureInfo.CreateSpecificCulture("zh-CN")), availableTime, type, appointmentTable));
 }