However, it’s important to note that it is influenced by the client’s local time zone (the time zone of the OS running the browser, to be exact).
Constructors and methods like parse(),getHour(),setHour(). The Date object in JavaScript manages time data using absolute numbers, such as Unix time, internally. var d = new Date() var n = d.getTimezoneOffset() // Returns UTC Offset in Minutesĭate Time Operations - Using Pure JavaScript But, the difference is hardly noticeable for everyday development. To put it another way, UTC is a better substitute for GMT. The caesium atomic frequency is used to set the time standard in this time system based on International Atomic Time. UTC was created in 1972 to address the Earth’s rotational slowing problem. But what if I tell you that they are not the same? Many people mistakenly believe that GMT and UTC are the same things, often used interchangeably. For example, Korea’s time zone is known as KST (Korea Standard Time), and it has a specific offset value of KST = UTC+09:00. It is typical for countries to name their time zones after themselves. For example, when we state that Indiana switched from Central to Eastern Time, Indiana's time zones shifted from one offset to another. In addition, laws can alter a time zone’s offset or daylight savings schedule. Offset - Difference from the ReferenceĪ time zone’s offset the number of hours or minutes it is ahead of or behind GMT.īecause of Daylight Saving Time, the offset of a time zone might shift throughout the year. local time in New York is GMT -5 hours in winter and GMT -4 hours in summer). Conversely, local time is behind GMT west of the Greenwich Meridian (e.g. If you are east of the Greenwich Meridian, your local time is usually ahead of GMT (for example, local time in China is GMT +8 hours). This travels from the North Pole to the South Pole, going past the Greenwich district of London’s Old Royal Observatory. To do that we need a reference which is the Greenwich Mean Time (GMT). This offset is the number of minutes added to the world time to obtain each countries time zone. The world is divided into time zones, each with its offset.
Before jumping into details, let’s understand some terminology around time zones.
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