Time Zone Converter for cities

How does this time zone converter for cities function?

This is a useful time tool, designed to be simple and easy to use and to offer you the exact information you need. Please observe that all the fields in the left column can be modified and that the right column is the area in which the results will appear once you make your choices and press calculate. The first two fields are the current date and time and you can change according to your needs. Below are two lines in which you need to choose the starting point for the international time conversion and the location for which you want to find the corresponding time. In each of the two lines you first need to choose the region in order to narrow your choice. You can choose from Africa, Asia, Australia, Caribbean, Central America, Europe, North America and South America.

Once you decided for a region the second two selections will ask you to choose the cities you want o make the international time transformations for. As you press calculate the time zone converter for cities will find the cities in a complex database of the world time zones, check whether it needs to take into consideration the existence of a daylight savings and will then calculate the difference between your two locations and return you with the exact time in the second place you chose.

The conversion equation used by all conversions: "time in zone B" = "time in zone A" − "UTC offset for zone A" + "UTC offset for zone B".

When you can find yourself in need to use a time zone converter?

• Holidays: When you need to schedule more than one flight in the same day, when you’re going on a vacation in a foreign place that is far away and want to know exactly the local time there and whether the jet lag will affect you.
• Personal: When you need to call someone overseas or someone in your family is abroad and you want to know their time or you want to watch an online live broadcast from a certain place and you need to know when this happens in your location.
• Business: When making business phone calls or conferences abroad and you need to schedule them at an appropriate time for all the participants.
• Educational: a quick way to retrieve a country in a specific time zone or check if certain places use the daylight savings time system.
• The biggest the time difference is the harder will be for you to manage the calculations in any of the situations above without knowing exactly the local time in the places you’re considering.

Coordinated Universal Time (UTC):

The Coordinated Universal Time represents the modern civil time and has been defined since January 1972 to follow the International Atomic Time (TAI) with an exact offset of an integer number of seconds. Greenwich Mean Time (GMT) was the first time standard adopted in 1847 and followed time using telescopes and was calibrated to the mean solar time at the Royal Observatory in Greenwich, UK. This time keeping method is less exact than the UTC because the rotational period of Earth is not perfectly constant and the duration of a second would vary if calibrated to a telescope-based standard like GMT so the system was replaced with the UTC system in most countries.  Within this implementation most nations began to use the UTC standard when defining their time zones. A UTC time offset is the amount of time subtracted from or added to UTC to get the current local time for a specific location. Offsets from UTC are written in the ±[hh]:[mm] format.

Time zones are defined as geographical regions of Earth than can be observed on a world time zone map. Most of them are one hour apart and compute local time as an offset from UTC or GMT. Time offsets may vary in some places during summer months because of the practice of adopting the Daylight Savings Time (DST). The reference point for UTC is the Greenwich Meridian (the Prime Meridian), which has a longitude of 0°. Time Zone Boundaries are marked by the lines of longitude for each time zone being 15° westward or eastward the preceding time zone. Local time is UTC plus the current zone offset for the locations situated eastern to the meridian and UTC minus the current zone offset for the locations situated westward.