ranjan

A timezone is a region of the globe that observes a uniform standard time for legal, social and commercial purposes.  Time zones tend to follow the boundaries of countries and their subdivisions instead of strictly following longitude because it is convenient for areas in close commercial or other communication to keep the same time.  Prior to the late nineteenth century, timekeeping was a purely local phenomenon. Each town would set their clocks to noon when the sun reached its zenith each day. A Clock maker or Town clock would be the "official"time and the citizens would set their pocket watches and clocks to the time of the town. Travel between cities meant having to change once pocket watch on arrival. However, once railroads began to operate and move people rapidly across great distances, time became much more critical. In the early years of railroads, the schedules were very confusing because each stop was based on a different local time. The standardization of time was