I build a little macro which seems to fullfill what I'm looking for:
/*\
title: $:/core/modules/macros/date_title.js
type: application/javascript
module-type: macro
Macro to get the date from a tiddler title if title is starting with an
american date format (yyyymmdd) and convert it to date format dd.mm.yyyy.
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Information about this macro
*/
exports.name = "date_title";
exports.params = [];
/*
Run the macro
*/
exports.run = function() {
return this.getVariable("currentTiddler").substring(6,8) + "." + this.
getVariable("currentTiddler").substring(4,6) + "." + this.getVariable(
"currentTiddler").substring(0,4);
};
})();
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