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SQLAlchemy is an open-source Python library that provides an SQL toolkit (called "SQLAlchemy Core") and an Object Relational Mapper (ORM) for database interactions. It allows developers to work with databases using Python objects, enabling efficient and flexible database access.
A tri-temporal database has three axes of time: Valid time; Transaction time; Decision time; This approach introduces additional complexities. Temporal databases are in contrast to current databases (not to be confused with currently available databases), which store only facts which are believed to be true at the current time.
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]
Examples of datestamps: 2025-05-25 — ISO 8601 international representation of 2025 May 25; Examples of timestamps: 17:30:23 — time of day in an afternoon; 123478382 ns — the number of nanoseconds since boot; 17 minutes — an arbitrary minute counter that increments every 1 minute since its last manual "reset" event; Sequence number:
For example, the 6th day of the 1st month of the year 2009 may be written as "2009-01-06" in the extended format or as "20090106" in the basic format without ambiguity. For reduced precision , [ 18 ] any number of values may be dropped from any of the date and time representations, but in the order from the least to the most significant.
For example, 00:00:00 UTC on 1 January 1971 is represented in Unix time as 31 536 000. Negative values, on systems that support them, indicate times before the Unix epoch, with the value decreasing by 1 for every non-leap second before the epoch. For example, 00:00:00 UTC on 1 January 1969 is represented in Unix time as −31 536 000.
For instance, depending on the order style, the abbreviated date "01/11/06" can be interpreted as "1 November 2006" for DMY, "January 11, 2006" for MDY, and "2001 November 6" for YMD. The ISO 8601 format YYYY-MM-DD (2025-02-04) is intended to harmonize these formats and ensure accuracy in all situations. Many countries have adopted it as their ...
For 12-hour time, the point format (for example "1.45 p.m.") is in common usage and has been recommended by some style guides, including the academic manual published by Oxford University Press under various titles, [8] as well as the internal house style book for the University of Oxford, [9] that of The Guardian [10] and The Times newspapers ...