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, <[email protected]> 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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