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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).
YYYY-MM-DD; DD-MM-YYYY; DD Month YYYY; Month DD, YYYY; YYYY-MM; DD Month; Month DD; Month YYYY; YYYY; Month; Day and month numbers may be 1 or 2 digits, and year numbers may only be 3 or 4 digits. If you need to input a number less than 1000, use leading zeroes (e.g. "0700"). BC years can only be parsed if the date is only the year number.
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.
{{extract|date|options}} The following options are available: add=periods to add • Add/subtract time units. fix=on • Adjust invalid time units. partial=on • Accept a year only, or a year and month only. show=what to display • Specifies what should be extracted (such as dayname), or how to format the date (such as mdy).
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]
Standard format: 1- or 2-digit day, the spelled-out month, and 4-digit year (e.g. 4 February 2023) 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 ...
<date formatting style> controls the date format in which the result is to be emitted. Recognized values for the second parameter are: DMY gives d mmmm yyyy (e.g. 31 May 2007). This is the default format. MDY gives mmmm d, yyyy (e.g. May 31, 2007) YMD gives yyyy mmmm d (e.g. 2007 May 31) ISO gives an ISO 8601 style yyyy-mm-dd (e.g. 2007-05-31)
ISO 2014, though superseded, is the standard that originally introduced the all-numeric date notation in most-to-least-significant order [YYYY]-[MM]-[DD]. The ISO week numbering system was introduced in ISO 2015, and the identification of days by ordinal dates was originally defined in ISO 2711.