Answer:
some time after 1990 with a sort of futuristic setting
Step-by-step explanation:
Guy montag in the book says: 'Every hour so many d*mn things in the sky! How in h*ll did those bombers get up there every single second of our lives! Why doesn't someone want to talk about it! We've started and won two atomic wars since 1990!'. We don't know when exactly it took place.