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Civilian format: spelled out month, 1-or 2-digit day, a comma, and the 4-digit year (e.g. February 4, 2023). [12] 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 ...
Year–month–day (YMD) format—e.g., 2025-01-12 (also called the "all-numeric" format; used only where space is limited, such as in references and some tables and infoboxes, but not in article text proper). The appropriate format for a particular situation is determined by the (somewhat confusing) interaction between three sub-provisions of ...
National standard format is yyyy-mm-dd. [161] dd.mm.yyyy format is used in some places where it is required by EU regulations, for example for best-before dates on food [162] and on driver's licenses. d/m format is used casually, when the year is obvious from the context, and for date ranges, e.g. 28-31/8 for 28–31 August.
Apart from in mathematics articles, consider rounding to a reasonable resolution instead (e.g. a half farthing ≈£0.00052 not £0.0005208 3, an inch ≈0.333 palms not 0. 3 palms), or showing initial repeats before the overbar (e.g. 0.33 3). If overbars are used, consider explaining the notation on first use.
The first quarter of the year runs from January through March, the second quarter is from April through June, and so on. But companies operate on business-oriented “fiscal quarters” instead.
The term year 2000 problem, or simply Y2K, refers to potential computer errors related to the formatting and storage of calendar data for dates in and after the year 2000. Many programs represented four-digit years with only the final two digits, making the year 2000 indistinguishable from 1900.
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.
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 ...