The phrase "old day" evokes nostalgia and a time that has passed. Synonyms for this phrase include yesteryear, bygone era, historic period, antiquity, former times, and days gone by. Each of these phrases paints a different picture of the past, from a time that is long forgotten to a period that shaped our modern world. Yesteryear suggests a time that is more recent, but still distant enough to be considered part of the past. Bygone era implies a significant and distinct period of history. Historic period is a neutral term used to describe a particular time in the past. Antiquity refers to an ancient and long-forgotten time. Former times and days gone by are general phrases that can refer to any time that has passed.