want to convert date to the above required format. Is it possible to write a groovy script to do so in datamapper? If yes can you please give an example. Or can i reference another expression or component?
I think the simplest way to do what you need is to edit the datamapper script and replace the line where you perform the date mapping for this one:
output.date = date2str(str2date(input.date,"d/mm/yy"), "yyyy-mm-dd");
but replacing the input and output fields accordingly.