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Author:manus

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Date:2008-11-21T23:00:24.000000Z


git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@109 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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2008-11-21 23:00:24 +00:00
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documentation/current/solutions/dates-and-times/eiffeltime/eiffeltime-tutorial/absolute-time.wiki
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[[Property:uuid|195849fc-1a9c-d734-2d2b-acae78133886]]
The classes dealing with date and those dealing with time have many similarities. These classes descend from more abstract classes implementing the notion of value ([[ref:libraries/time/reference/time_value_chart|TIME_VALUE]] , [[ref:libraries/time/reference/date_value_chart|DATE_VALUE]] , [[ref:libraries/time/reference/date_time_value_chart|DATE_TIME_VALUE]] ). From this notion come two kinds of heirs which are the absolute notion of time (classes [[ref:libraries/time/reference/date_chart|DATE]] , [[ref:libraries/time/reference/time_chart|TIME]] and [[ref:libraries/time/reference/date_time_chart|DATE_TIME]] ) and the notion of duration (classes [[ref:libraries/time/reference/date_duration_chart|DATE_DURATION]] , [[ref:libraries/time/reference/time_duration_chart|TIME_DURATION]] , [[ref:libraries/time/reference/date_time_duration_chart|DATE_TIME_DURATION]] ).
[[ref:libraries/time/reference/date_chart|DATE]] , [[ref:libraries/time/reference/time_chart|TIME]] and [[ref:libraries/time/reference/date_time_chart|DATE_TIME]] inherit from the deferred class [[ref:libraries/time/reference/absolute_chart|ABSOLUTE]]. These classes model absolute temporal values, i.e., specific times and dates. Because <eiffel>ABSOLUTE</eiffel> inherits from <eiffel>COMPARABLE</eiffel>, the ordering functions <eiffel><</eiffel>, <eiffel>+</eiffel>, <eiffel>></eiffel>, and <eiffel>>=</eiffel> are available on instances of [[ref:libraries/time/reference/absolute_chart|ABSOLUTE]] and its descendants.
[[ref:libraries/time/reference/date_chart|DATE]] , [[ref:libraries/time/reference/time_chart|TIME]] and [[ref:libraries/time/reference/date_time_chart|DATE_TIME]] inherit from the deferred class [[ref:libraries/time/reference/absolute_chart|ABSOLUTE]]. These classes model absolute temporal values, i.e., specific times and dates. Because <eiffel>ABSOLUTE</eiffel> inherits from <eiffel>COMPARABLE</eiffel>, the ordering functions <eiffel><</eiffel>, <eiffel><=</eiffel>, <eiffel>></eiffel>, and <eiffel>>=</eiffel> are available on instances of [[ref:libraries/time/reference/absolute_chart|ABSOLUTE]] and its descendants.
==TIME==