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The format string used in strftime traces back to at least PWB/UNIX 1.0, released in 1977. Its date system command includes various formatting options. [2] [3] In 1989, the ANSI C standard is released including strftime and other date and time functions. [4]
The C standard library uses Unix time for all date and time functions, and Unix time is sometimes referred to as time_t, the name of the data type used for timestamps in C and C++. C's Unix time functions are defined as the system time API in the POSIX specification. [15]
As of MySQL 8.0.28, released in January 2022, the functions FROM_UNIXTIME(), UNIX_TIMESTAMP(), and CONVERT_TZ() handle 64-bit values on platforms that support them. This includes 64-bit versions of Linux, macOS, and Windows. [32] [33] In older versions, built-in functions like UNIX_TIMESTAMP() will return 0 after 03:14:07 UTC on 19 January 2038 ...
System.DateTime.Now [19] System.DateTime.UtcNow [20] 100 ns [21] 1 January 0001 to 31 December 9999 CICS: ASKTIME: 1 ms 1 January 1900 COBOL: FUNCTION CURRENT-DATE: 1 s 1 January 1601 Common Lisp (get-universal-time) 1 s 1 January 1900 Delphi date time: 1 ms (floating point) 1 January 1900 Delphi (Embarcadero Technologies) [22] System.SysUtils ...
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 ...
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 .
Reference Timestamp: 64 bits Time when the system clock was last set or corrected, in NTP timestamp format. Origin Timestamp (org): 64 bits Time at the client when the request departed, in NTP timestamp format. Receive Timestamp (rec): 64 bits Time at the server when the request arrived, in NTP timestamp format. Transmit Timestamp (xmt): 64 bits
In a popular Unix shell Bash, time is a special keyword, that can be put before a pipeline (or single command), that measures time of entire pipeline, not just a singular (first) command, and uses a different default format, and puts empty line before reporting times: