Define time zone?

A time zone is a region of the Earth that has the same standard time. Time zones are used to coordinate time across different regions of the world, taking into account the Earth's rotation and the need for consistent timekeeping. Each time zone is typically one hour ahead or behind the adjacent time zone, and they are usually based on lines of longitude.

A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. Time zones are defined by local laws or regulations and are based on the Coordinated Universal Time (UTC) standard. The Earth is divided into 24 time zones, each of which is 1 hour apart. The Prime Meridian at 0° longitude in Greenwich, England, is the basis for UTC and, therefore, for all time zones. Time zones are usually represented by their offset from UTC, such as UTC+01:00 or UTC-05:00.