Text substitution (e.g. $(myvariable)$ ) only happens inside of macros. So 
you need to define a macro.

This version seems to work:

\define mymacro() <$action-setfield $tiddler=
"$:/plugins/vpl/jazzbokMem/DbActivity"  $index=<<now $(myVariable)$ >> 
$value="hello" />

<$button>
<$set name="myVariable" value={{!!date-format}}></$set>
Test<<mymacro>>
</$button>

Good luck!

On Wednesday, August 21, 2019 at 6:48:28 AM UTC-7, vpl wrote:
>
> Hi
>
> A stupid question ... but how to pass a variable to a macro in wikitext
> I can't find any example
>
> <$button>
> <$set name="myVariable" value={{!!date-format}}></$set>
> <$action-setfield $tiddler="$:/plugins/vpl/jazzbokMem/DbActivity"; 
> $index=<<now $(myVariable)$ >> $value="hello" />
> Test
> </$button>
>
> My date-format field contains "YYYY-0MM-0DD:hh:0mm:0ss"
> When I click on the button this action populate the data-tiddler with the 
> following content
> {
>
> "$(myVariable)$": "hello"
>
> }
>
>
> Where I'm expecting
>
> "2019-08-21:15:20:09": "hello"
>
>
> Any idea would help me a lot
>
>
> Thanks for your support
>
>
> Vpl
> ",
>
>

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