Question

What is the purpose of having time zones?

Answer 1

Countries like Russia, Canada and USA have a large ​east‒west stretch. We know that as the time at any place depends on the longitude of that place, a large longitudinal extent thus can lead to non-uniformity in time within different places in the same country. Thus, to avoid this, in 1884, the world was divided into 24 standard time zones to ensure uniformity and predictability in the time zones.