y: default format for date will be standard date object (see above)
    - with given format option, the date will be converted to a string, e.g. '%d.%m.%Y'	represents DD.MM.YYYY.
	  For options see https://jtsage.dev/DateBox/doc/3-3-output/
	- to globally change time format for timeboxes, use the override method of JTSage in your visu.js:
	  jQuery.extend(jQuery.jtsage.datebox.prototype.options, {overrideTimeOutput: "%H:%M", overrideTimeFieldOrder: ["h","i"] })
*
* @author Stefan Widmer
* @info Inspired by 