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ISO 3166 codes (2-letter, 3-letter, and 3-digit codes from ISO 3166-1; 2+2-letter codes from ISO 3166-2) ANSI: 2-letter and 2-digit codes from the ANSI standard INCITS 38:2009 (supersedes FIPS 5-2) USPS: 2-letter codes used by the United States Postal Service USCG
The codes are used in Geographic Names Information System, overseen by the U.S. Board on Geographic Names. The codes were assigned by NIST and each uniquely identified a state, the District of Columbia, or an outlying area of the U.S.
Each code consists of two parts, separated by a hyphen. The first part is US , the ISO 3166-1 alpha-2 code of the United States. The second part is two letters, which is the postal abbreviation of the state, district, or outlying area, except the United States Minor Outlying Islands which do not have a postal abbreviation.
All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...
The US system has weeks from Sunday through Saturday, and partial weeks at the beginning and the end of the year, i.e. 52 full and 1 partial week of 1 or 2 days if the year starts on Sunday or ends on Saturday, 52 full and 2 single-day weeks if a leap year starts on Saturday and ends on Sunday, otherwise 51 full and 2 partial weeks.
The two-letter country codes were used by the US government for geographical data processing in many publications, such as the CIA World Factbook. The standard is also known as DAFIF 0413 ed 7 Amdt. No. 3 (Nov 2003) and as DIA 65-18 (Defense Intelligence Agency, 1994, "Geopolitical Data Elements and Related Features").
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]
The Rata Die method works by adding up the number of days d that has passed since a date of known day of the week D. The day of-the-week is then given by (D + d) mod 7, conforming to whatever convention was used to encode D. For example, the date of 13 August 2009 is 733632 days from 1 January AD 1. Taking the number mod 7 yields 4, hence a ...