[rules-users] Date arithmetic in when part

[rouvas at mm.di.uoa.gr]

Wolfgang Laun wrote:
> 2011/6/30 <rouvas at mm.di.uoa.gr>
>
>> What are the available symbolics for temporal values?
>> That is, d is for days, m is for minutes, h is for hours, s is for
>> seconds.
>> Are there any other symbolics specifically for months and years?
>>

Thanks for the clarification.

>
> You can use ms for millisecond. There are no universally acceptable
> duration
> values for monts and years .

Neither are the chosen values "universally" acceptable.
How about following "man date" conventions?

-Stathis

> -W
>
>
>>
>> I haven't found any mentioning of them in the Fusion manual.
>> I'm using 5.0.1
>>
>> Thank you,
>> -Stathis
>>
>> Wolfgang Laun wrote:
>> > See the "Fusion" manual, section on Temporal Reasoning/Temporal
>> Operators.
>> > Even when the facts aren't events, these operators can still be
>> applied
>> to
>> > fields of type Date, e.g.
>> >
>> >     $p1: Person( $dob1: dob )
>> >     $p2: Person( $dob2: dob after[3d] $dob1 )
>> >
>> > -W
>> >
>> >
>> > On 28 June 2011 18:02, <rouvas at mm.di.uoa.gr> wrote:
>> >
>> >> Hi list,
>> >>
>> >> I feel this should be an elementary question but unfortunately I
>> haven't
>> >> been able to find a solution.
>> >>
>> >> I would like to perform date arithmetic in the when part of a rule.
>> >>
>> >> For example, I would like to express something like:
>> >>
>> >> rule "Date compare rule"
>> >>  dialect "mvel"
>> >> when
>> >>  a : A()
>> >>  b : B( a.creationDate <= b.creationDate after 3 months)
>> >> then
>> >>  ...
>> >> end
>> >>
>> >> Apart from using eval()'s is there any other way to express these
>> types
>> >> of
>> >> comparisons?
>> >>
>> >> Thank you for your time,
>> >> -Stathis
>> >>
>> >>
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>> >>
>> >
>>
>>
>>
>