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| | ISO 8601 |
 | | The value starts with "P", and is followed by a list of periods, each appended by a single letter designator: "Y" for years, "M" for months, "D" for days, "W" for weeks, "H" for hours, "M" for minutes, and "S" for seconds. |
 | | Formats are also given for periods of time, either by listing the start and end dates or as a given length of time. |
 | | Any particular date/time format is a subset of these possible values, and the standard lists various permissible subsets. |
| www.mcs.vuw.ac.nz /technical/software/SGML/doc/iso8601/ISO8601.html (1159 words) |
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