i si tid

Prepositional phrase

 * 1) once formerly; during some period in the past
 * 2) in one's time; in one's day in the time when one was of a certain age
 * 1) in one's time; in one's day in the time when one was of a certain age

Usage notes

 * In the second sense, the pronoun might be changed in accordance with the subject of the verb to which the prepositional phrase is an adverb. In the first sense, it is more of a fixed expression. Confer with the usage examples.
 * Both senses indicate a temporal location. This location may also lie in the future.