Thanks to your response BJ. However, (and I maybe misunderstood something 
in your solution) but it provides me the same result as my solution which 
is that the created tiddler (with *title* {{fooTimeLine!!appointmentName}}) 
as a field *end* that equals to "$macrocall $name="dateTime" 
ts={{fooTimeLine!!dueto}} format="YYYY0MM0DD0000000" add="+1D"/> and not to 
the corresponding subsitution. Any ideas ?

Thanks in advance,

Le mercredi 25 janvier 2017 18:46:35 UTC+1, BJ a écrit :
>
> HI Peuhpeuh,
>
> there are may ways to fix this, problably the easiest is to change the 
> macro:
>
>
>
> \define nextDay(day)
> <$macrocall $name="dateTime" ts={{$day$}} format="YYYY0MM0DD0000000" add=
> "+1D"/> 
> \end 
> dateTime
> <$set name="end" value=<<nextDay "fooTimeLine!!dueto">>>
>
>
>
>
> all the best
>
> BJ
> On Wednesday, January 25, 2017 at 5:03:10 PM UTC, peuhpeuh singe wrote:
>>
>> Hello twexperts !
>>
>> I have a tiddler "fooTimeLine" with a field "dueto" containing a date in 
>> tw format. I then want to create a button that is associated to the 
>> creation of a new tiddler having as fields:
>> 1) "dueto" with the value in "fooTimeLine" and 
>> 2) "end" with the value corresponding to the day after those of "dueto"
>>
>> My problem is with point 2). I use the nice dateTime macro 
>> ($:/macros/skeeve/dateTime.js 
>> at http://tiddlystuff.tiddlyspot.com) but I do not know how to resolve 
>> the different macro evaluations:
>>
>>
>> \define nextDay(day)
>> <$macrocall $name="dateTime" ts=$day$ format="YYYY0MM0DD0000000" add=
>> "+1D"/> 
>> \end 
>> dateTime
>>
>> <$set name="end" value=<<nextDay {{fooTimeLine!!dueto}}>>>
>>
>> <$button>
>> <$x-maketid  $title={{fooTimeLine!!appointmentName}}  tags="Date" text="a 
>> few comments"
>>  dueto={{fooTimeLine!!dueto}} end=<<end>>/>
>>
>> Create
>> </$button>
>>
>> </$set>
>>
>>
>>
>>  which does not work due to the fact macro consists in simple 
>> substitution. I am ok with why it does not work but I do not know how to 
>> tackle the problem without rewritting a dedicated macro and I thus request 
>> your help : Can we deal with nested macro calls and how ?
>>
>

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