![]() Time zones are complicated by the use of Daylight Saving Time, which changes the actual offset of a given location to vary over the course of the year. Adelaide, Australia has an offset of nine and a half hours ahead of UTC, and Nepal has an offset five hours and forty-five minutes ahead of UTC. ![]() Most, but not all, time zones are in offsets of whole hours. Time zones, as mentioned above, are defined as an offset from UTC. UTC is a good standard for the internal representation of dates and times, as it makes comparing datetimes or doing datetime math much easier. In this system UTC is Z, sometimes called “Zulu”. The US military has a set of terms used for time zones around the world based on the alphabet (A-Z). The widely used term GMT (Greenwich Mean Time) refers to a time zone that is equivalent to UTC. Time zones around the world are specified as an offset from UTC. ![]() UTC time is measured at the prime meridian (O degrees longitude). It is an international standard which is kept using atomic clocks, and is kept to within 0.9 seconds of the rotation of the earth on its axis in order to work well with traditional standards of time-keeping. UTC stands for “Coordinated Universal Time”. Here are some terms that I’ll be using in this article: In order to understand what you might want to do with dates and times, it’s good to have a handle on some basic concepts.
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