Again, what script will the new Drag & Drop calendar date change feature call?

Again, what script will the new Drag & Drop calendar date change feature call?

I'm desperately trying to negate the effects of  the drag and drop feature because it does not allow me to control the manner in which users change record dates.  I haven't been able to get any script to call upon a drag and drop[UPDATE: the problem was on my end...I was testing older dates that didn't have my control field value loaded.] If someone would please post here an example of calling script with the drag and drop I would greatly appreciate it.