![]() ![]() Internationally, it is normally called Daylight Saving Time (DST). ![]() ![]() “Summer time” is a term mostly used in the U.K. But it’s not right to treat the time and offset of a certain region the same for the following reasons: Summer Time (DST)Īlthough this term might be unfamiliar to some countries, a lot of countries in the world adopted summer time. Time zone != offset?Īs I mentioned earlier, we use the names of time zones (KST, JST) interchangeably with offset without distinguishing them. The entire list of UTC offsets and their names can be found in List of UTC Time offsets. For example, North Korea uses +08:30 as their standard time while Australia uses +08:45 or +09:30 depending on the region. Some offsets are not strictly on hourly basis. The list of countries in the +09:00 offset can be found in UTC+09:00. However, the +09:00 offset is also used by not only Korea but also Japan, Indonesia, and many others, which means the relation between offsets and time zone names are not 1:1 but 1:N. For example, the time zone of Korea is called KST (Korea Standard Time), and has a certain offset value which is expressed as KST = UTC+09:00. It’s common that countries name their time zone using their own unique names. The difference of time between UTC standard time and the local time is called “offset”, which is expressed in this way: +09:00, -03:00, etc. This means that it’s 09:00 PM in Korea when it’s 12:00 PM in a UTC region. +09:00 in UTC+09:00 means the local time is 9 hours ahead than the UTC standard time. However, none of the either side won the fight, so they came to an agreement of using UTC instead, as it contained all the essential letters (C, T, and U). When the system was still in development, anglophones wanted to name the system CUT (Coordinated Universal Time) and francophones wanted to name it TUC (Temps Universal Coordonn). Although the actual time difference between the two is tiny, UTC is whatsoever the more accurate choice for software developers. In other words, UTC is the more accurate replacement system of GMT. This time system is based on International Atomic Time, which uses the cesium atomic frequency to set the time standard. UTC was established in 1972 to compensate for the slowing problem of the Earth’s rotation. ![]() Many consider GMT and UTC the same thing, and the two are used interchangeably in many cases, but they are actually different. 5, 1925 and became the world time standard until Jan. GMT is an abbreviation for Greenwich Mean Time, which is the clock time at the Royal Observatory in Greenwich, U.K. The Korean local time is normally GMT +09:00. This sometimes results in such an awkward situation where the sun rises around 10:00 AM in the western part of China GMT, UTC, and Offset GMT Interestingly, even though China is large enough to have multi time zones, she uses only one time zone. It’s common for many countries to have its unique time zone, and some large countries, such as the USA or Canada, even have multiple time zones. What is Time zone?Ī time zone is a region that follows a uniform local time which is legally stated by the country. In this light, I will first discuss the definition and standards related to time zone in detail, and then talk about JavaScript. As I was writing this rather lengthy article, I suddenly realized that the root of my problem lied in my poor understanding of the time zone domain. The purpose of this article is to discuss the issues and solutions related to the implementation of time zone features using JavaScript. For this reason, I had a valuable and thrilling experience of solving a problem leading to cause more problems. Implementing time zone features beyond simple formatting of time and calculating time data with complex operations (e.g. However, my hope was false, and I found it really hard to handle time zone in JavaScript as I progressed more. I pretty well knew that the time zone support in JavaScript is quite poor, but hoped that abstracting existing data objects would easily resolve many problems. Recently, I worked on a task of adding a time zone feature to the TOAST UI Calendar, the JavaScript calendar library managed by my team. ![]()
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