* 時間 (じかん, jikan): This is the most common and generally accepted kanji for "time," often referring to a period of time or a schedule.
* 時刻 (じこく, jikoku): This refers to a specific point in time, like the time on a clock.
* 時代 (じだい, jidai): This means "era" or "period" referring to a historical time.
* 時 (とき, toki): This is a more general kanji for "time" but often used in the context of a point in time or occasion.
Therefore, 時間 (jikan) is usually the best and safest choice unless you need a more specific meaning.