Using our tool you can find the time difference between your selected cities with our time zone converter. Just input any date, past, present or in the future. All the time zones around the world together represent twenty-four hours. In reality, though, a time zone is a region of the Earth that has the same time. Therefore, the world is theoretically divided into twenty-four 15 degree longitudinal sections that serve as time zones. This time zone tool will then give you accurate results taking daylight saving time amendments into account. Not all areas that have the same time fall exactly within the fifteen-degree slot. Time zones are usually adjusted in accordance with the boundaries of countries and/or their subdivisions because of the convenience of areas in close proximity or commercial dealings having the same time. Transportation is another factor too that affects the time a country or region will have.
The primary purpose of time zones around the world is to facilitate transportation and communication. A standard timekeeping system was needed to facilitate accurate legal and commercial dealings. Early use of time zones was confusing, as different stations along a single railroad could have had different standard times, therefore, confusing passengers and even railway staff. The transportation sector sought to address that with the introduction of standard time zones for their purposes, which was partially successful. However, in 1883, the United States began to use four standard time zones and in 1884 Britain sought to gain international acceptance for time zones around the world.