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In 1996, the international format yyyy-mm-dd was made the official date format in standardized contexts such as government, education, engineering and sciences. However, as it failed to establish itself, the traditional format (d)d.(m)m.(yy)yy was allowed again as an alternative in 2006 (except in areas where there is risk of ambiguity).
Date Time Group format, used most often in operation orders. This format uses DDHHMMZMONYY, with DD being the two-digit day, HHMM being the time on a 24-hour clock, Z being the timezone code, MON being the three-letter month, and YY being the two-digit year. For example, 041200ZFEB23 is noon, UTC, on 4 Feb 2023. [13]
RFC 3339 Date and Time on the Internet: Timestamps specifies YYYY-MM-DD, i.e. a particular subset of the options allowed by ISO 8601. [10] RFC 5322 Internet Message Format specifies day month year where day is one or two digits, month is a three letter month abbreviation, and year is four digits. [11]
The little-endian format (day, month, year; 1 June 2022) is the most popular format worldwide, followed by the big-endian format (year, month, day; 2006 June 1). Dates may be written partly in Roman numerals (i.e. the month) [citation needed] or written out partly or completely in words in the local language.
Since portions of the population continued to use the old format, the traditional format was re-introduced as alternative to the standard YYYY-MM-DD format to DIN 5008 in 2001 and DIN ISO 8601 in September 2006 but its usage is restricted to contexts where misinterpretation cannot occur. The expanded form of the date (e.g., 31.
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 ...
For example, passports issued by the Department of Foreign Affairs, which particularly notates the date alphanumerically as DD-MMM-YYYY, legislative bills and executive orders are dated alphanumerically with a MMMM-DD-YYYY format. The little-endian (day-month-year) date format is always written alphanumerically by default to avoid confusion.
Alternatively, a format for duration based on combined date and time representations may be used by agreement between the communicating parties either in the basic format PYYYYMMDDThhmmss or in the extended format P[YYYY]-[MM]-[DD]T[hh]:[mm]:[ss]. For example, the first duration shown above would be "P0003-06-04T12:30:05".