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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]
ISO 8601 Data elements and interchange formats – Information interchange – Representation of dates and times specifies YYYY-MM-DD (the separators are optional, but only hyphens are allowed to be used), where all values are fixed length numeric, but also allows YYYY-DDD, where DDD is the ordinal number of the day within the year, e.g. 2001 ...
The format dd.mm.yyyy using dots (which denote ordinal numbering) is the traditional German date format, [65] and continues to be the most commonly used. In 1996, the international format yyyy-mm-dd was made the official date format in standardized contexts such as government, education, engineering and sciences.
ISO 2014, though superseded, is the standard that originally introduced the all-numeric date notation in most-to-least-significant order [YYYY]-[MM]-[DD]. The ISO week numbering system was introduced in ISO 2015, and the identification of days by ordinal dates was originally defined in ISO 2711.
The date argument can be given as a literal date, in MM/DD/YYYY format (other date formats are not accepted). Alternatively, the date argument can be given as a number, in which case it is taken to mean an age in days (i.e., the day date days before the present date).
The year-month-day order, such as the ISO 8601 "YYYY-MM-DD" notation is popular in computer applications because it reduces the amount of code needed to resolve and compute dates. It is also commonly used in software cases where there are many separately dated items, such as documents or media, because sorting alphanumerically will ...
YYYY-MM-DD has become prevalent in citation footnotes largely as an accidental by-product of the former date autoformatting policy, now abandoned. The assumption was that readers would not actually see the date in that form. YYYY-MM-DD numerical dates were designed for computers to read; we are writing for humans, not machines.
The Standards Council of Canada also specifies this as the country's date format. [12] [13] The YYYY-MM-DD format is the only officially recommended method of writing a numeric date in Canada. [2] The presence of the DD/MM/YY (most of the world) and MM/DD/YY (American) formats often results in misinterpretation. Using these systems, the date 7 ...