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The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO) since 1988 (last revised in 2019) and, before that, it was defined in ISO (R) 2015 since 1971.
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]
Another two-digit date code, the RKM production date code, use YM, where Y is one of 20 letters that repeat in a cycle every 20 years (for example, "M" was used to represent 1980, 2000, 2020, etc.) and M indicates the month of production (1 to 9 indicate January to September, O indicates October, N indicates November, D indicates December).
Some manufacturers also used the production date code as a stand-alone code to indicate the production date of integrated circuits. [33] Some manufacturers specify a three-character date code with a two-digit week number following the year letter. [34] IEC 60062 also specifies a four-character year/week code.
Besides that, in Hungary the big-endian year-month-day order has been traditionally used. In 1995, also in Germany, the traditional notation was replaced in the DIN 5008 standard, which defines common typographic conventions, with the ISO 8601 notation (e.g., "1991-12-31"), and is becoming the prescribed date format in Germany since 1996-05-01.
IPC is a trade association whose aim is to standardize the assembly and production requirements of electronic equipment and assemblies. IPC is headquartered in Bannockburn, Illinois, United States with additional offices in Washington, D.C. Atlanta, Ga., and Miami, Fla. in the United States, and overseas offices in China, Japan, Thailand, India, Germany, and Belgium.
Date and time notation around the world varies.. An approach to harmonize the different notations is the ISO 8601 standard.. Since the Internet is a main enabler of communication between people with different date notation backgrounds, and software is used to facilitate the communication, RFC standards and a W3C tips and discussion paper were published.
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]