If I understand what you want -- separating dates by past/present/future, 
then I think you actually want the *days *filter operator:

https://tiddlywiki.com/#days%20Operator

That should be much easier than using prefixes.

Good luck,

Mark

On Wednesday, February 28, 2018 at 3:07:55 AM UTC-8, @magasine wrote:
>
> Hi,
>
> I have a question!
>
> My TW has titled tiddlers with a prefix that references dates, as in the 
> examples below:
>
> 20180115 - Content of the Past
> 20180228 - Present Content
> 20180315 - Content of the Future
>
> I have a macro (StartupActions: 
> http://ooktech.com/jed/ExampleWikis/StartupActions/) that is turned on 
> for page load, directing the fill of fields of certain tiddlers, with an 
> appropriate status: past, present or future.
>
> Question:
>
> How can I build a filter that can display each of these conditions, past, 
> present, and future, based only on the prefix analysis contained in the 
> titles, compared to the system date I get from the macro << now YYY0MM0DD >>
>
> My code:
>
> \define tempNodeColor()
> <$set name="hoje" value=<<now YYYY0MM0DD>> >
> <$set name="tagMesM" value=<<now YYYY-0MM>> >
>
>  <!-- ADICIONA COR GREEN AO NODE DO MM E TAG ANO-MES DO MES CORRENTE, CASO 
> NÃO EXISTA -->
>
> <$list filter="[all[]prefix<hoje>]">
> <$action-setfield $field="_tgr_node_class_add" $value="my-green-node" />
> <$action-listops $field=tags $subfilter='+[append<tagMesM>]'/>
> </$list>
>
> <!-- ADICIONA CORES AO NODE DO MM PARA CONTEÚDOS TAGEADOS COM 
> EVENTOS-REALIZADOS E EVENTOS-REALIZANDO -->
>
> <$list filter="[tag[Past]]">
> <$action-setfield $field="_tgr_node_class_add" $value="my-gray-node" />
> </$list>
>
> <$list filter="[tag[Present]]">
> <$action-setfield $field="_tgr_node_class_add" $value="my-green-node" />
> </$list>
>
> </$set>
> </$set>
> \end
>
> <<tempNodeColor>>
>
>
>
>

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