Good old time is a phrase that is often used to describe a period in the past that evokes feelings of nostalgia and sentimentality. However, there are many synonyms that can also be used to describe this same feeling. Some examples include "the good old days", "the golden age", "time of yore", "halcyon days", "nostalgic era", "retro period", "vintage era", "classic times", "champagne days", "age of innocence", and "romantic period". Each of these synonyms carries its own unique connotations and can be used to describe different periods of time, depending on the speaker's perspective and personal associations.