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There are a few determining factors of time zones, but mostly time zones are based on the lines of longitude of the Earth and the Prime Meridian, which is the starting point, or zero-degree, line of longitude.

To convert 18:00 UTC (6:00 p.m.) into your local time, subtract 6 hours, to get 12 noon CST. During daylight saving (summer) time, you would only subtract 5 hours, so 18:00 UTC would convert to 1:00 p.m CDT. Note that the U.S. uses a 12-hour format with a.m. and p.m. Other countries use 24-hour time.

The four main ones are Eastern, Central, Mountain, and Pacific Standard Time. The two others are Alaska Standard Time and Hawaii-Aleutian Standard Time, observed only by Alaska and Hawaii respectively.

The earth spins through 360 degrees in 24 hours, meaning that in one hour the earth spins through (36024=)15 degrees. This means that, technically, as you travel around the earth, each 15 degrees of longitude difference in the location of places means that they should have a time difference of one hour.

The time zone converter on Savvy Time is a helpful resource for those looking to easily find time differences between different locations. Users can choose to compare between time zones or cities, and will find the current time in both locations.

Calculating time zones is simple and involves adding or subtracting an hour for every 15 degrees of longitude.

World Time Buddy (WTB) is a convenient world clock, a time zone converter, and an online meeting scheduler. Itʼs one of the best online productivity tools for those often finding themselves traveling, in flights, in online meetings or just calling friends and family abroad.