![]() For example, North America has 12 time zones based on how far they are from North American Eastern Prime Meridian (EPIM). Time zones are defined by how far the region is from the prime meridian. ![]() ![]() The primary time zone is named Greenwich. There are also regions called time zones that are based on different cities or towns. A leap second is added to the calendar every few years to avoid changes in the length of the year as Earth rotates. The accuracy of a computed UTC timestamp is then ± 0.9 second when averaged over a 30-minute period. Every day, UTC is updated at 3 am Pacific Standard Time (PST) through 6 pm PST. Each region chooses its own date and time offset from UTC. UTC is also used in schools, governments and businesses to keep their systems running on the same schedule. Universal synchronous time (or UTC), formerly known as Coordinated Universal Time (or UTC), is the primary time standard used in aviation, the automotive industry, and the scientific and technical communities. Its simple numeric representation and easy convertibility make it a convenient choice for many applications. Overall, the Unix timestamp is a versatile and widely-used tool for tracking and representing dates and times in computer systems. For example, a Unix timestamp could be used as part of a digital signature to verify the authenticity of a document or message. In addition to its use in computer programming, the Unix timestamp is also commonly used in other fields, such as cryptography and network security. To convert a Unix timestamp to a human-readable date and time, a programmer can use a function or library that is capable of converting the timestamp to the desired format. This is useful when displaying the timestamp to users, or when comparing timestamps to determine the time difference between two events. One of the benefits of using a Unix timestamp is that it can be easily converted into a human-readable date and time format.
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