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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