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Author:admin
Date:2008-09-19T07:54:43.000000Z git-svn-id: https://svn.eiffel.com/eiffel-org/trunk@25 abb3cda0-5349-4a8f-a601-0c33ac3a8c38
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jfiat
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[[Property:title|Absolute time]]
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[[Property:weight|0]]
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[[Property:uuid|195849fc-1a9c-d734-2d2b-acae78133886]]
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The classes dealing with date and those dealing with time have almost the same construction. At the top of the hierarchy are the constants and 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]] ).
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[[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 <eiffel>ABSOLUTE</eiffel>. It implies that instances of these classes are used as absolutes. We can imagine an oriented axis on which are reported values. <eiffel>ABSOLUTE </eiffel>inherits <eiffel>COMPARABLE</eiffel>, there is a complete order inside the class and its heir. <eiffel>ABSOLUTE</eiffel> is a client of <eiffel>DURATION</eiffel>, so that each instance of <eiffel>ABSOLUTE </eiffel>is linked with the duration between the origin and itself.
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[[Property:title|DATE / TIME to STRING Conversion]]
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[[Property:weight|3]]
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[[Property:uuid|88972ba4-694b-8558-b0c8-87b1fc40afc4]]
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The following table lists format conversion codes.
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{|
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|-
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[[Property:title|Duration]]
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[[Property:weight|1]]
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[[Property:uuid|64672bd0-b696-0c39-1e30-5ac64aae4a99]]
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<eiffel>TIME_DURATION</eiffel>, <eiffel>DATE_DURATION</eiffel> AND <eiffel>DATE_TIME_DURATION</eiffel>
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The classes dealing with duration inherit DURATION, which inherits GROUP_ELEMENT and PART_COMPARABLE. An instance of <eiffel>TIME_DURATION</eiffel>, <eiffel>DATE_DURATION</eiffel> or <eiffel>DATE_TIME_DURATION</eiffel> is an element of a group, i.e. there is a zero and addition operations (infix +,infix -, prefix + and prefix -). Duration is used as an amount of time, without link to an origin. It may be added to the respective absolute notion (time + time_duration is possible, not time + date_time_duration nor date_time + time_duration...see classes <eiffel>TIME</eiffel>, <eiffel>DATE</eiffel> and <eiffel>DATE_TIME</eiffel>).
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[[Property:title|EiffelTime]]
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[[Property:link_title|EiffelTime Tutorial]]
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[[Property:weight|0]]
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[[Property:uuid|2c1bfedd-d515-cd6b-bd22-b06326fc98d8]]
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The library EiffelTime is built on three notions of time. The absolute notion (for example, what time is it? 3:45 p.m.) is used for events. It may be useful also to deal with an interval between two events (the meeting is between 3:45 p.m. and 6:00 p.m.). Finally EiffelTime has the notion of duration, which is the length of an interval (the meeting will take 2:15). The notion of absolute is linked with duration by the use of an origin.
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[[Property:title|Interval]]
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[[Property:weight|2]]
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[[Property:uuid|d33d0216-fa71-60dc-f3b0-61ff42d621e6]]
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Class <eiffel>INTERVAL</eiffel> deals with intervals between two instances of the same class which conform to<eiffel> ABSOLUTE</eiffel> ( <eiffel>DATE</eiffel>, <eiffel>TIME</eiffel>, <eiffel>DATE_TIME</eiffel>). The notions of interval is directly linked with the notion of order.
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The <eiffel>start_bound</eiffel> must be before the <eiffel>end_bound</eiffel>.
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[[Property:title|More precision]]
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[[Property:weight|4]]
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[[Property:uuid|fadf5bc2-bb72-f681-b9c4-bab7f0633209]]
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<eiffel>TIME</eiffel> and <eiffel>TIME_DURATION</eiffel> are designed to deal with high precision in time. The only limit is the one from number representation.
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The classes <eiffel>TIME</eiffel> and <eiffel>TIME_DURATION</eiffel> have an attribute <eiffel>fine_second</eiffel> (inherited from <eiffel>TIME_VALUE</eiffel>) which allows high precision. This attribute represents the number of seconds with fractions (it is an instance of <eiffel>DOUBLE</eiffel>). From this attribute are calculated second and fractional_second (which are functions): second is the truncated-to-integer part and fractional_second is the difference between the two previous one, so that the sum of second and fractional_second is always equal to fine_second (see invariant in <eiffel>TIME_VALUE</eiffel>).
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[[Property:title|EiffelTime Library]]
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[[Property:link_title|EiffelTime]]
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[[Property:weight|9]]
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[[Property:uuid|3d96626f-11f3-67a2-dec6-69f7faf4a8d6]]
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Type: Library <br/>
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Platform: Any <br/>
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[[Property:link_title|Dates and times]]
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[[Property:weight|-13]]
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[[Property:uuid|082fd8e1-b531-6cf1-3409-9cd9bc6483ad]]
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* Date and time manipulation
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** EiffelTime
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*** EiffelTime tutorial http://ise181.ise/book/documentation/eiffeltime
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*** EiffelTime class reference
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== Date and time manipulation ==
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* [[EiffelTime Library|EiffelTime]]
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** [[EiffelTime|EiffelTime tutorial]]
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** EiffelTime class reference
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