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ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]
Software timekeeping systems vary widely in the resolution of time measurement; some systems may use time units as large as a day, while others may use nanoseconds.For example, for an epoch date of midnight UTC (00:00) on 1 January 1900, and a time unit of a second, the time of the midnight (24:00) between 1 January 1900 and 2 January 1900 is represented by the number 86400, the number of ...
Etc/GMT+2: Canonical −02:00: −02:00-02 etcetera Sign is intentionally inverted. See the Etc area description. Etc/GMT+3: Canonical −03:00: −03:00-03 etcetera Sign is intentionally inverted. See the Etc area description. Etc/GMT+4: Canonical −04:00: −04:00-04 etcetera Sign is intentionally inverted. See the Etc area description. Etc ...
Class – each clock is a member of a given class, each class getting its own priority. Accuracy – precision between clock and UTC, in nanoseconds (ns) Variance – variability of the clock; Priority 2 – final-defined priority, defining backup order in case the other criteria were not sufficient. Smaller numeric values indicate higher priority.
1 January 1970 (to 19 January 2038 prior to Linux 5.9) to 2 July 2486 (Since Linux 5.10) 1 January 1970 to 4 December AD 292,277,026,596 1 μs: 1 ns OS/2: DosGetDateTime() 10 ms 1 January 1980 to 31 December 2079 [18] Windows: GetSystemTime() 1 ms 1 January 1601 to 14 September 30828, 02:48:05.4775807 GetSystemTimeAsFileTime()
In this case, if the transaction's timestamp is after the object's read timestamp, the read timestamp is set to the transaction's timestamp. If a transaction wants to write to an object, but the transaction started before the object's read timestamp it means that something has had a look at the object, and we assume it took a copy of the object ...
The term "timestamp" derives from rubber stamps used in offices to stamp the current date, and sometimes time, in ink on paper documents, to record when the document was received. Common examples of this type of timestamp are a postmark on a letter or the "in" and "out" times on a time card .
In computer science, type conversion, [1] [2] type casting, [1] [3] type coercion, [3] and type juggling [4] [5] are different ways of changing an expression from one data type to another. An example would be the conversion of an integer value into a floating point value or its textual representation as a string , and vice versa.