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Viamoro time zone converter

The time zone converter is a free tool, provided by Viamoro enable to calculate time differences between cities and countries. Feel free to change all the time zone parameters according to your needs. You can change the time the date and the locations.

Noways, when we all live in a big global village, it is very common to have time zone misunderstanding especially if having meetings cross cities and countries. Avoid those confusions by using this simple time zone converter.


Time is a certain period, which is measured in minutes and hours, defining the past, presence, and future. For centuries, people used different techniques to measure the time, the days and the years.

The most accurate were the atomic clocks but because of the earth's irregular shape and irregular sun movements, people needed to create an international time zone system. Following will be explained the time zone method, world time zones, the time zone history, and what is the difference of GMT and UTC.

world time zone converter

Time Zone Method

Time Zone is e term, which refers to 24 zones/regions where a standard time is kept, different from its neighboring zones. Each of those regions is divided by longitude (around 15 degrees wide) and the starting point is the Greenwich Meridian, the prime meridian. To understand better, it means that the first zone to east from the Greenwich Meridian is one hour ahead; the second zone east from the Greenwich Meridian is two hours ahead and so on. In other words, the time changes one hour forward or backward depending on the location of the country, east of west from the Greenwich Meridian.

However, if one country lays in two or even three time zones, it does not mean that each city in the country will have a different time; rather one non-standard time zone is accepted and used. This is the case with India and China which have only one time zone disregarding its borders and vastness. Countries like Russia and United States have more than one time zone.

The time zones are using positive or negative offsets or in other words the western countries use (UTC) and the eastern counties (UTC+). It is quite interesting how the time zones work, for example if a country is located at (75°) 75 degrees East longitude, it should be divided by 15 in order to get the right time in that country or zone. It this case the time in this country/zone will be +5 hours from the Greenwich Time or UTC+5 (Universal Coordinated Time). So to say that if a certain country is located at (75°) 75 degrees West longitude, it is divided by 15 and the right time in this country/zone will be minus 5 hours from the Greenwich Time or UTC-5 (Universal Coordinated Time.

Daylight Saving Time or DST means that during the summer period one hour is added to the standards time. Moreover, other countries add one hour during the winter period such as Spain.

People started to create and use the time zones late in the 19th century. The urge to do that was initiated by the globalization and expansion of transport and means for communication. In 1884 the Greenwich Meridian was accepted to be the prime meridian for unified time keeping. Moreover, many meridians were used as a longitudinal border between two times zones and that is how a new international and unified time-keeping system had been created.

World Time Zones

During a 24 hours day and 360 degrees longitude, it is logical to have 24 standard time zones. In accordance to that, each of the zones has to be 15 degrees wide. However, many scientist debate that instead of 24 time zones, there should be 25 time zones.

Before the clock was invented people used different methods to tract the time. They used a variety instruments to observe the sun at noon. During the mid of 17th century a pendulum clock had been invented. Later in 1764, John Harrison invented an amazing clock with an extraordinary accuracy, which was popular among mariners. Yet for years later, people continue to use their own accepted system to measure the time, which was merely based on the solar system. Therefore, when the railroads started to expand, each town would set a clock, which would show their locally accepted time. This was a real problem because it was difficult to coordinate the trains and passengers were getting more and more confused. This was mainly a problem in USA but it concerned the rest of the world. A temporary solution was to establish a railroad time zone but that was only a temporary period.

In 1883, Britain adopted a standard time system, which influenced the United States to accept the Standard Time Zone System (4 zones). That had a global impact for creating unified global time zones or international standard time system, which happened on October in 1884 on the International Meridian Conference held in Washington, USA. The key advocate, the one who organized the International Meridian Conference and helped in creating the time worldwide system was Sir Standorf Fleming. The Greenwich Meridian was established as the prime meridian. Moreover, the world's standard time was Greenwich Mean Time or GMT. Years later in 1928 the term Universal Time (UT) was introduced by the Astronomical Union.

Most of the countries accepted the hourly time zones by the late 1920's. It is interesting to know that Paris accepted the standard time zone (UTC +1) in 1978 because for years France continued to treat Paris as the prime Meridian.