Days gone by can be described by its antonyms, which include present time, current, contemporary, modern, and futuristic. These words represent the opposite of what has already taken place or what has become history. Present time refers to the time that we are currently living in, while contemporary means something that is happening or existing now. Modern describes something that is new, up-to-date, or relevant to the current time. On the other hand, futuristic represents something that is related to the future, upcoming, or innovative. Using these antonyms in place of days gone by can create a sense of anticipation and excitement for the future.