We have different time zones all over the world because the Earth is divided into 24 time zones, with each time zone representing a different hour of the day. The time zones are based on the rotation of the Earth and the fact that the Earth completes one full rotation in 24 hours.
Since the Earth is a sphere, the sun does not rise and set at the same time everywhere. When it is noon in one place, it may be early morning or late evening in another location. To standardize time and avoid confusion, the world is divided into time zones, each spanning roughly 15 degrees of longitude, or one hour of time difference.
The time zones were first proposed in the late 1800s by Canadian railway engineer Sir Sandford Fleming, who saw the need for a standardized time system to coordinate train schedules across vast distances. In 1884, the International Meridian Conference in Washington D.C. established the Prime Meridian in Greenwich, England, as the reference point for measuring longitude and divided the world into 24 time zones.
While there have been minor adjustments to time zones over the years, the basic system remains the same today. Different countries and regions may choose to observe Daylight Saving Time, which involves moving the clock ahead by one hour during the summer months to extend the amount of daylight in the evening. However, the fundamental system of time zones remains consistent across the world.