This most often refers to an exact time represented by the number of seconds since Unix epoch. Temporal has two types that store exact time: Temporal.Instant (which only stores exact time and no other information) and Temporal.ZonedDateTime which stores exact time, a time zone, and a calendar systemĪnother way to represent exact time is using a single number representing the amount of time after or before Unix epoch (midnight UTC on January 1, 1970).įor example, Temporal.Instant (an exact-time type) can be constructed using only a BigInt value of nanoseconds since epoch.Īnother term developers often encounter is "timestamp". The Z suffix indicates that this is an exact UTC time. ISO 8601 and RFC 3339 define standard representations for exact times as a date and time value, e.g. However the same calendar date and wall-clock time India would have an offset of +05:30: 5½ hours later than UTC. ![]() It is effectively a successor to Greenwich Mean Time (GMT).Įvery wall-clock time is defined using a UTC Offset: the amount of exact time that a particular clock is set ahead or behind UTC.įor example, on Januin California, the UTC Offset (or "offset" for short) was -08:00 which means that wall-clock time in San Francisco was 8 hours behind UTC, so 10:00AM locally on that day was 18:00 UTC. It is within about 1 second of mean solar time at 0° longitude, and is not adjusted for daylight saving time. When Daylight Saving Time (DST) starts or if a country moves to another time zone, then local clocks will instantly change.Įxact time however has a consistent global definition and is represented by a special time zone called UTC (from Wikipedia):Ĭoordinated Universal Time (or UTC) is the primary time standard by which the world regulates clocks and time. Wall-clock time is controlled by local governmental authorities, so it can abruptly change. The core concept in Temporal is the distinction between wall-clock time (also called "local time" or "clock time") which depends on the time zone of the clock and exact time (also called "UTC time") which is the same everywhere. Ambiguity Caused by Permanent Changes to a Time Zone Definition.Ambiguity Due to DST or Other Time Zone Offset Changes. ![]()
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