1.
time slot, time period, hours
A range or block of time within a day, such as morning hours, rush hour, or a specific broadcast slot.
2.
time zone
A geographical region that observes a uniform standard time, such as Japan Standard Time or Eastern Time.
Usage
Sense 1 (time slot) is the more common usage in daily Japanese. Refers to a block of hours within a day, such as 朝の時間帯 (morning hours), ラッシュの時間帯 (rush hour), or ゴールデンタイムの時間帯 (prime-time slot).
Sense 2 (time zone) is used in international contexts. Japan is in a single time zone (JST, UTC+9) and does not observe daylight saving time.