Wikipedia suggests that Larry Niven's Known Space stories start around 2000 CE. I was reminded that, early in World of Ptavvs, the main character is having dinner with a visitor from West Germany (!) and the political situation is mentioned:
"The conversation ranged explosively during dinner. As Larry said later, "It's fun to meet someone who likes to argue about the same things you do." They compared Los Angeles' outward growth to West Berlin's reaching skyscrapers."
Is anyone aware of a moment in the book where the date is specifically mentioned? I'll reread it eventually — I remember it as a great story — but would like to know now!