"In time past" is a phrase that refers to a period of time that has already elapsed. It can be used to describe events or situations that took place a long time ago, or to refer to a long-ago historical era. There are several synonyms for this phrase, including yesteryear, former times, bygone days, previous years, ancient history, olden days, and days gone by. These phrases can be used interchangeably with "in time past" to convey the same meaning. Whether you say "in time past" or one of these synonyms, the message remains the same - it refers to a time that is no longer current or present.