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mm – two-digit month, e.g. 03; mmm – three-letter abbreviation for month, e.g. Mar; mmmm – month spelled out in full, e.g. March; d – one-digit day of the month for days below 10, e.g. 2; dd – two-digit day of the month, e.g. 02; ddd – three-letter abbreviation for day of the week, e.g. Fri; dddd – day of the week spelled out in ...
Three-letter abbreviations are accepted (e.g. Jan, Feb, etc.) w: weekday numeric format, spelt out in full or abbreviated Three-letter abbreviations are accepted (e.g. Sun, Mon, etc.) The weekday numbering follows ISO practice (Sunday → 0, Monday → 1, ... Saturday → 6). n: count numeric format, spelt out in full or abbreviated
In communications messages, a date-time group (DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC).
Between the first and third centuries CE, the Roman Empire gradually replaced the eight-day Roman nundinal cycle with the seven-day week. The earliest evidence for this new system is a Pompeiian graffito referring to 6 February (ante diem viii idus Februarias) of the year 60 CE as dies solis ("Sunday"). [3]
Visas and passports issued by the U.S. State Department also use the day-month-year order for human-readable dates and year-month-day for all-numeric encoding, in compliance with the International Civil Aviation Organization's standards for machine-readable travel documents. [7] [8]
A variation with three cubes providing English abbreviations for the twelve months is discussed in a Scientific American column in December 1977. [6] One solution of this variation allows displaying the first three letters of any month and relies on the fact that lower-case letters u and n and also p and d are inverses of each other.
In Spanish, abbreviations of month names are usually three letters long, to avoid confusion between marzo (March) and mayo (May), and between junio (June) and julio (July). In Spain, the week runs from Monday to Sunday. The Spanish language also has an established convention for days of the week using one letter.
France most commonly records the date using the day-month-year order with an oblique stroke or slash (”/”) as the separator with numerical values, for example, 31/12/1992. The 24-hour clock is used to express time, using the lowercase letter "h" as the separator in between hours and minutes, for example, 14 h 05.