Not sure what you try to do, but you can use a custom formatter for this purpose (where you can use this library).

Regards

Tony

need some help or advise how I can implement datejs?

It seems to be much easier and faster to simply enter +3days or +1hour instead of using ui.datepicker especially when you need also a timepicker.

Some help would really save me time as I am not the real javascript guru 😉

Thanks