729Time-intervals in ISO 8601
- Jan 15, 2004Two dates separated by a solidus as in ISO 8601 or a hyphen or the
like imply a time-interval with known start and end. It may be used
for anniversaries of something, such as 1776--2001 for the 225th
anniversary of the United States. However, when it is used for
somebody, it usually means the dates of birth AND death of a person,
such as Anita MUI Yim-fong (1963--2003 or 1963-10-10--2003-12-30 to
be precise) who recently died in Hong Kong.
ISO 8601 does not include a time-interval with known start but
unknown end. As a double hyphen may be used in place of a solidus,
the date of birth of former US President Ronald Wilson Reagan may be
written as something like 1911-02-06-- (with no definite end as he is
alive). It is not ISO 8601-compliant. See also my
http://www.geocities.com/jusjih/knightrider.html#74 for another
example showing time-intervals with or without known ends.
P.S. My http://www.geocities.com/jusjih/num-iso8601.html is to be
split to 5 pages:
Formats and examples of ISO 8601 annotated in 3 languages are now at:
http://www.geocities.com/jusjih/iso8601.html (reinstated URL)
Numbers, Dates and Time in English (en), French (fr) and Chinese (zh)
are now at:
For dates and time, these pages also use ISO 8601 whole showing how
to read them in 3 languages.
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