Display problem:  identifier showing instead of actual data

Display problem:  identifier showing instead of actual data

  
Usually, when I have an ID field on a webscreen, it will show the name versus the actual id number. I have a date/time field on one table, OfficeHours, that I have added as an officehours identifier on another table, appointments. On the appointment list webscreen, the actual identifier appears instead of the date/time. I need to make sure the date/time appears versus the identifier. What do I need to do? Thanks!