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Author:tedf

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Date:2009-01-05T12:39:54.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@151 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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tedf
2009-01-05 12:39:54 +00:00
parent 5cda4a74a4
commit ffc468f138
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documentation/current/solutions/dates-and-times/eiffeltime/eiffeltime-tutorial/duration.wiki
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[[Property:title|Duration]]
[[Property:weight|1]]
[[Property:uuid|64672bd0-b696-0c39-1e30-5ac64aae4a99]]
The classes <eiffel>[[eiffel:?system=time.78D80981-EF3C-42EC-8919-EF7D7BB61701&target=time&cluster=time&class=TIME_DURATION TIME_DURATION]]</eiffel>, <eiffel>DATE_DURATION</eiffel>, and <eiffel>DATE_TIME_DURATION</eiffel> model time durations.
The classes <eiffel>TIME_DURATION</eiffel>, <eiffel>DATE_DURATION</eiffel>, and <eiffel>DATE_TIME_DURATION</eiffel> model time durations.
The classes dealing with duration inherit from <eiffel>DURATION</eiffel>, which in turn inherits from <eiffel>GROUP_ELEMENT</eiffel> and <eiffel>PART_COMPARABLE</eiffel>. From this lineage comes the query <eiffel>zero</eiffel>, the addition features <eiffel>infix +</eiffel> and <eiffel>infix -</eiffel> and the unary features <eiffel>prefix +</eiffel>, and <eiffel>prefix -</eiffel>.