//!*script
// get Today.js (YYYYMMDD)
var d = new Date();
var year = d.getFullYear().toString();
var month = ('0' + (d.getMonth() + 1)).slice(-2);
var day = ('0' + d.getDate()).slice(-2);
PPx.result = year + month + day;

以上のスクリプトを↓こんな感じで使う
%"Make Directory" *makedir %{%*script(%0\getToday.js)%}